Casio PRG50 Titane Pro Trek Watch,
compass, thermometer, altimeter, barometer, solar powered.

Le 21 juillet 2003, par James

An excellent outdoors watch review.

My Suunto X6 being in the mail for a few months [1], I decided for a replacement.

I choosed the Casio PRG50 Titanium.

Here it it on my wrist


This Casio model was pretty attractive, 240 Euros on the net, to have it delivered the next day, transport included.

The watch band is titanium, the glass is a lens-effect mineral glass, the top casing of the watch is metal, as well as the bottom plate. The light button and sensor protection are painted plastic (metal paint over grey plastic).

The "double lock" metal band lock


This watch runs on a rechargeable battery, it is recharged by solar panels placed in circle just arround the LCD display. Amazingly, it is a very small surface. I tried a charge, and it effectively takes 1 hour to go from half charge to full charge in summer, the watch has since not shown to be low on battery.

The watch got 6 buttons : set-up, mode, light, alti, baro, compass.

A better view, the dark band between the display and the metal case, is the solar panel



This is a rather classic casio triple sensor module for the rest, and the functions/features are as follows :

  • Time and Date. A good thing is that the date is displayed in YY MM-DD format, wichh avoid me to be trapped by the MM-DD YY english convention [2] used in older similar Casio modules. I love being able to read the date without incertitude !
  • One daily alarm.
  • Compass. Compass data is shown on the two level LCD display. One level shows the bearing in numeric, the highest semi-transparent level is used to display a compass rose.
  • Barometer, does not show sea-level pressure but actual pressure. A graph is filled with the last 24 hours data.
  • Altimeter, also filling a graph as it takes measures.
  • Solar powered, with a recheargeable battery.
  • Power saving : when the watch is not in use, and in darkness, the watch turns to sleep-mode, blanking the display. Using the light, or increasing the amount of light received by the solar panels wakes it up. Can be turned down.
  • Auto light : when the light received by the solar panels is low, turning the wrist from flat to 45 degrees towards you turns the electro-luminescent panel on for 2 seconds. Very clever, and very useful. Can be turned down.
  • Waterproof 100 meters, or 10 bars.
  • There is some chronometric function, but the precision is to the second.


Compass mode and the double layered LCD


  • Compass : accuracy 10 degrees. The actual precision seems to be better than that, and I got some 2-3 degrees accuracy most of the time. There are two calibrating procedures : one on fixed bearing, where you need a compass to do it, and one in free bearing mode, where you basically need to take one measure in any direction, then turn the watch, and calibrate the opposite direction. Easy enough to be done everywhere. The precision is still not that of a Suunto Vector. It seems to be reasonably sensible to inclinations. More work seems needed into checking this function.

Altimeter mode


  • Altimeter : 5 meters precision, magnitude -10000 to 10000. The X6 had a one meter "clumsy" precision, I prefer the 5 meter increments. The experiments I have done so far were effectively 5 meters close to the real altitude, even when climbing 500 meters, or a kilometer, so I rate this as an excellent precision. There is a data recording altimeter mode, for 41 records spaced of 15 or 5 minutes. The altimetric graph is a good visual aid. Recorded values are max, min, relative altitude, total ascent, etc... There is an altitude alarm, and it can be calibrated.

Barometer and thermometer mode


  • Barometer : Displays the actual barometric pressure in 1 hpa (or mb) increments, and not the corrected sea pressure. There is actually no way to get the sea level pressure without external computation. This is not a problem to me as what I am interested in is the graph, which shows the evolution, and can be interpreted easily in terms of weather. It can be calibrated.
  • Thermometer, displays the watch temperature, but can be calibrated.

The measurement units, originally metric, can be changed : hours in the anglo-saxon 12 hours am/pm system, temperatures in degrees F, or heights in ft, pressures in inHg.


The titanium band is a pleasure to wear, even in hot weather. It seems a much better asset than a plastic band.

The watch is big, rather like a Suunto Vector. A bit more heavy.

The functions are easilly accessed, though some advanced processing is difficult to remember.

The automatic light is a pleasure to have in dark conditions, as it lights on a simple move of the wrist. The dedicated light button is quite useful too.

The altimeter seems pretty accurate, and the compass totally funtional.

The watch goes on sleep mode and out of it, totally unnoticed, as it wakes up at the least sollicitation, or in day/reading light.

Time display


The solar charging of the battery is something I look forward to talk after some more time with the watch, as I know from experience that these watches get pretty less water resistant when opened to change the battery. This is not needed here, so I expect a good life expectancy (some 10 years from the manufacturer’s words). Nothing worst than having an expensive watch showing battery low signs when you know you will not be able to change it for sometime, because you are in the field [3].

This is very different from a Suunto Vector, or even X6, some functions, I will regret, like multiple alarms, count-downs, or even precise chronograph, but on the other side I can easily do without [4].


The Casio PRG50T seems to be a good watch. I like the zero maintainance idea, we shall see how long it really lasts.

There are some very good ideas, which turns out to be very convenient, to the expense of some more classical functions.

Overall, It is much better than previous similar Casios I have owned 5 or 6 years ago [5], and coming very close to the Suuntos.

Update 18-Aug-2003

I have now been wearing this watch for a month, and the more I use it, the more I like it. It is sturdy enough, and the features of the auto-light is brilliant. Water resistance seems up to the task, and the sensors have kept precision, even after diving to low depths almost every day since I got it. The altimetric (& barometric) accuracy is actually excellent, much better than what I was getting with the (normally more precise) Suunto X6.

One little reproach about the compass is the lack of inclinometer to make sure the watch is flat when taking the measure. A good way to get a precise measure is to align the north of the watch with the north shown (then the compass is less sensible to wrist rotation), find flatness with the angle of the arm, and then find the bearing. If water is at hand, dropping water on the glass and trying to make the best repartition can help finding flatness. Also a sight could have been a good move. Another little reproach is that the glass catches reflects a lot, and often can only be read when perpendicular to the eyes. Yo can see this on my pictures already.

The solar charging seems to work well, and the battery indicator has never left the fully charged state.

Update 6-Sept-2005

Watch still running fine, battery fine. I have been wearing it every day since last update, one of the first watch that suvives such a long time to my treatment. All is good.

Post-Scriptum :

I will update this review as time passes.

Notes :

[1] See Suunto X6 watch..

[2] Very confusing compared to the DD MM YY that I generally use.

[3] Yes it happened to me.

[4] I did not really use them in fact when I had them.

[5] Suunto X6 watch. to see these.

par James



Le 4 août 2003

Just purchased a Casio prg-50. I notice the pressure units are given as ’hPa’. Is this a mis-type ? I presume it’s supposed to be ’kPa’ - kilopascals. Or is the hPa a new unit I’m not familiar with ? Thanks for any feedback.

Ed. West Yorks, UK.

Le 4 août 2003

Right, hPa is for hecto Pascals. 1 hPa equals one milibar (mb), the older mesure that was in use in the metric system world. So I suppose that using hPa instead of kPa satisfies people used to mb too, without needing another scale.

Also it probably avoids the use of a decimal dot, which would make things even more complicated for the display and people (french uses "," and english uses "." just as and example) ... But hPa is commonly used by the French forecasters, as an example.

Also, hPa is used on all barometric watches I have used so far (Suuntos and Casios).

Hope this helps.

Le 14 septembre 2003

thanks for this great review, i saw this watch in tokyo for Y28000 but didn’t get it...would’ve helped to have dual time and a chronometer, but oh well ! want to find a good deal somewhere :)


Le 25 septembre 2003

As my Suunto X6 came back yesterday from service, I did some quick tests between the PRG50 and the X6, and came to the following discoveries :

  • The compasses have approximately the same accuracy, provided they are held flat and recently calibrated. The PRG50 compass has an helpful second layer LCD rose, but no sight, and the X6 no rose, but a sight.
  • The Barometers are not set the same, I would need a precision barometer to know which one is right (if there is one) but there is a 2 HPa difference between both current altitude measures.
  • The altimeter of the new X6 seems more accurate than the one on the old one.
  • The Altimeter xor (exclusive or) barometer mode on the X6 is not as convenient than the altimeter or (inclusive or) barometer mode of the PRG50.
  • It is always difficult to describe how a watch resists to time, but the X6 does not seem great in that aspect. The new one I got strikes my memory, when compaired to the one I sent for service, after only 9 month use, it was scratched, the band has changed color, like if it had absobed dirt, and the mate plastic finish had let a glassy polished plastic aspect, also loosing most of the painted inscriptions. If you have owned a swatch, it is very close to what you can expect for a X6 (except for the mineral glass), as both are ABS casings. The PRG50 seems to survive much better on that aspect, the titanium case and band helping to protect the watch a bit better. The casing is ABS, but covered with metal on the top, and with a screwed metal plate on the bottom part.
Le 30 septembre 2003

Hi There,

I recently purchased a Casio PRG50 1V on-line and it seems pretty good. I sail a bit and thought it might be useful to have. However, I was dismayed to find that the watch doesn’t have a Stopwatch. Then I notived in the online descriptiuon, that there is a Stopwatch in Altimeter mode. Does anyone know how this works. I’ve had a look and can’t seem to find it - and I do need a stopwatch for race starts - so any info would be much appreciated. Thanks, Pat.

Le 1er octobre 2003

Easy :

You set the watch to altimeter mode (alti button) and then you press "alti" again until it double bips, you have then started the altimeter recording stopwatch (rec is blinking) which is very limitated (only one sec precision, no laps), but better than nothing. To view the data, press the "adjust" button, it will show the altitude difference where the altitude was, and the time counter where the time was. Press "alti" until it double bips to stop the chronometer.

You can review the recorded data by pressing twice on "mode" from the altimetric display (use "alti" and "comp" to navigate through the different recorded data.

Hope this helps.

Le 7 octobre 2003

Hi JM !

Many thanks for this - that’s so easy to follow - the instruction manual was sooo user unfriendly !

Anyway, you’ve helped loads - so again, Thank YOU !


Le 8 octobre 2003

Hi Pat,

We must both thank my internet retailer, which had the good idea to add his own addendum to the Casio documentation then ;-).


Le 11 octobre 2003
Hellow ! I am interested in low teperature resistance details.They say it is resistable to -10 C.Does it mean the whole watch will not function when colder(let’s say -15 or -20 C )or it means only the sensors will not function while temp is lower than -10 C ? Does the exposure to temperatures below -10 C can make any damage to watch and it’s sensors ?
Le 12 octobre 2003

It is said to be accurate down to -10 C, barometer and temperature sensor. I suppose that under, it is not accurate anymore for these values (-10 to 60 C), that is why they give it as working range. I did come close to 60 once (let it in summer sun), and the display went black, it came back to normal with the lowering of the temperature.

So I do not know how it will resist under -10 C, but what you could expect is LCD disfunctionments, and battery problems, but I doubt anything permanent, if you do not try to use it or push any button, because at these temperatures, the rubber seals may break or get damaged. Who wants to try one in the freezer ? ;) So regarding this, there may be a huge difference depending if you talk about storage or operating.

My view on this, is that the watch will rarely reach these extremes. If you wear the watch, there is no way it will ever reach -10, or 60. If you take it off, well caution applies. And I’d take care to operate the watch only when it is within the recommended temperature ranges.

hope this helps,

Le 12 octobre 2003

I have read the suunto X6 review and the casio PRG50 review. It seems like you want to like X6 better, but it is unreliable. To summarise, which would be the best to buy ? [Or are there others out there that offer the same specifications ?]


A confused buyer.

Le 13 octobre 2003

Hello confused buyer :-)

Let me put it this way :

For a month now, I have the PRG-50 and the X6 in the same time, and I generally wear the Casio, because it feels better on my wrist (and I said feels, not looks).

I do not know if the X6 problems are solved on all series, but really if I had known, I would have simply not bought it. I find these kind of problems unacceptable on > 300 Euro watches. The X6 will not survive time as well as the PRG-50. Suunto made the Vector, which is a bit of the same size than the PRG-50, and it has been a very very good watch that lasted 4 years, for 150 Euro.

The Suunto has better precision, but that is relative. When using the compass, it is highly recommended to calibrate first on both watches. The Casio works without care, the Suunto must be set in the right Altimetric or Barometric mode, if you want to collect data, which is utopic after a long day working.

The X6 gets you a clinometer, but how often do you need one ? The clinometer could be used to give better compass precision, but it is not (I mean not to the extend it could). The X6 has 3 alarms that can be positioned with a date, and a nice chronometer. The Casio has kind of a chronometer, and only one alarm. The PRG-50 battery will not fail you while on hols or camping, the Suunto lives one year.

Last consideration one is a fully plastic casing and band watch, the casing will get scratched, the band will discolor. The other one is a plastic-metal hybride casing and band, and it will certainly survive longer and better.

In the same category from Suunto : Vector, Advisor, Metron, from Casio, there are some without the solar charger (search the web for casio pro trek, or casio triple sensor). There are of course a lot of others. The interest with casio and Suunto, is that both are on this market since it’s beginning.

Hope this helps

Le 27 octobre 2003

I have just received my watch an confused about the altimeter. With the reference set to ’off’ the reading varies over a period at the same level. Should the reading be constant or will it vary as the pressure changes ? For example, overnight and wearing the watch the reading changed from +20 to -10 whilst lying in bed. Over that period the barometric pressure changed from approx 1010 to 1015. Any ideas ?

Thanks Steve

Le 28 octobre 2003

Quite normal, The barometric pressure is subject to weather changes. Storms have the pressure go down, generally, and steady weathers go back up.

Compass, Baro and Alti need to be calibrated to be accurate. Compass, because it is very sensible to in-house magnetism, electric motors etc... Baro or Alti, because the two functions are tied, I generally set the altitude, as it is rare to have a precision barometer under hand.

The Suunto X6 bypasses the problem of this altimetric-barometric correlation by forcing the user to choose a mode, either baro if you are steady, or alti if you are moving, but indeed the watch is never in the mode you need.

The real information of these watches is not in the absolute values, but in the differences of value, thus the barometric graph for when you are steady, and the "record " mode when you move.

Le 8 janvier 2004

Hi JM !

Thank you for the review of the Casio PRG50 Titane Pro Trek watch. I’m thinking of bying the PRG60 watch, and I wonder if the PRG50 can measure the right temperature with the watch on the wrist, or do you have to take it off for a while to get the right temperature ?

/Best regards Ken Karlsson

Le 14 janvier 2004

Hi JM !

Thanks to your detailed review I decided to buy the PRG 50T watch. I’ve had it for about 3 weeks and now I have a problem and I need some help. The batery power display on the watch is showing full charge, but when I try to use the light function it goes into RECOVER mode and the back light is desabled. So I don’t use the back light and I leave it in the sun for a while to charge but when I go to use it again it stil goes into RECOVER mode, the first time I press the button, even if I havent used the back light for a few days and it has full charge. There is the same problem with compas function too. The watch has a full charge and is not in recover mode but compas still doesn’t work and shows ERR, error on the display. I’m really getting frustrated with this watch and I would appreciate any kind of advice from you JM.

I hope you can help me !

Thanks a lot JM,

Dragomir !

Le 16 février 2004

Hi JM,

I am also thinking of getting the same watch but the 50t-7v version. Do you know if the 60t-7av is better i assume so by the numbers. But after looking at the casio site and looking at the spec list. It looks the same to me except from the watch display.


Le 15 mars 2004

Hi, I have owned a Casio PRG50 for 12 months, unfortunately for 8 months of that time the watch has been sitting on the window ledge. I bought the watch online from the USA. I live in the UK. After only 4 months wear the battery went flat.. the watch when placed in direct sunlight (hence the window ledge) says it is charging but after just a short time worn on the wrist the battery is totally flat and all settings once again lost. In my opinion either the battery is defective or the solar charging on the watch is not working. I have been trying to source a new battery (CTL 1616) but cant seem to find a supplier in the UK. I have refrained from taking my watch to a casio dealer as I wanted to fix it myself. Anyone got any ideas of the problem ? Where I can source a new battery or any advice ? Thanks in advance and Take Care All


Le 15 avril 2004


Does the Casio have a dual time feature ? Can you set sea level pressure on the Casio or only absolute pressure ?

Thanks in advance.

Le 26 avril 2004
Hi, Would it be a good idea to buy a Suunto Advizor or a Vector now ? Or are these warches too old now ?
Le 19 juillet 2004
How can get a full charging light indoors for a this casio watch ? Thanks to all !
Le 30 août 2004
I have the real solution for charging CTL 1616 out of the watch, when you can’t charging it in solar mode. Email me !!!
Le 1er septembre 2004
Hi i have one of these watches and i am trying to work out how to use the Measuring modes : Elapsed time, split time, 1st-2nd place times. Would someone be able to explain this, as i have read the manual and can not figure it our thanks.
Le 14 septembre 2004

I got the PRG50 about a year ago online, and now the battery is not working, no matter how long I leave it out in the sun. Does anyone know where I can get a replacement battery or who to send it to for repair ? I live in New York.

Thanks !


Le 14 décembre 2004
Thanks very much indeed for the reveiw, it was exellent ! I am seriously considering buying one of these...but have to say was very disapointed to hear about the solar problems...has anyone any new details on this matter please ? also cant believe they didn’t put a timer on it ???? Cheers all Matt
Le 23 décembre 2004

Hello, I read a few concerns with the battery charge, here are my findings with time.

In summer, the battery is always full. In winter I often go into the half charge mode.

Reason : in summer, I am a lot outside, nude arms. In winter too, but I wear a garnment whose sleeves hide the watch.

If the battery is tired, just stick it in the sun for some time, if there is no sun, under a halogen spot, but at respectable distance, because these things emit some heat too (check often, this has to be done in summer sun too).

If you store the watch, be sure it is in a dark place, so that it goes into conservation mode (which is woken up by light).

If this does not work, contact a casio dealer to obtain a replacement battery...

So far the model I have is doing real fine, after 2 years of intensive wear, with still the same baterry. Looking backward, this was an excellent buy for me.

Le 5 janvier 2005
Hi there, I have been getting wrong readings on the altimeter of my PRG-50 : one day is 155 and the other one is -55 at the same place... What causes these abrupt changes and how can I solve it, please ? :’-(
Le 5 février 2005

Hello To all !

I’ve Bought Casio PRG50 about two years ago. It worked perfectly , until last month, that suddenly the compass , altitude measure and barometer stopped to work. When I activate my Compass , It doesn’t show the arrow at all , and when it gets back to the clock mode it displays "ERR" on the top lcd panel. The light of the clock also stopped working . Does anyone Knows that kind of a problem and / or a solution ?

Thanks In Advance. Nir

Le 23 mars 2005
Hi, i just bough this watch but found out that it has no chrono, although it says that it can be used in the altimeter mode. could you please advise on how to do this ? thanks. I do not mind that the seconds do not show.
Le 14 août 2005


your message is quite a while old and I hope your PRG-50 works o.k. again. I have a PRG-50 myself and had the same problem at the very beginning. I sent it to the CASIO service and they exchanged the battery. As it was a garanty case I didn’t have to pay a single Cent. The watch works perfect since then.


Tom P.
Le 15 août 2005

I agree with that there is a problem with Casio Tough Solar watches retaining a charge. I purchased a Casio Tough Solar Tide watch (PAS201) and loved the design and functions, but after about a year it would no longer hold a charge, even after days in the Sun. It’s now completely blank and put away as I don’t think a new battery will solve the issue. Just a design flaw IMO.

BTW, I know someone else who has had a Casio Tough Solar Wave-Ceptor watch for about a year, and is beginning to have a similar problem. The light won’t work (goes to "recover" even though the indicator shows full charge) and it needs constant charging to stay alive. Funny thing is, I have a 20 year old original G-Shock with the original battery that still works perfectly, including the light !.

Anyway, I have another suggestion for an altitude/barometer/thermometer/compass watch, which I’ve owned for 9 month or so : The HighGear Summit. Large (like the Casio and Suunto) but lightweight (you barely notice you’re wearing it, and the band is wide and comfy) and the great thing is that it has a user-replacable "coin-twist" battery compartment (CR2032).

Only water resistant to 20 meters, but it’s fine for splashing through streams and rain storms. Has chronograph functions, dual time, a weather predictor that is actually very accurate, and a 24 hour atmospheric pressure graph. Compass reads in degrees only (no pointer) but seems to be very accurate. Like most of this class of watch, the temp is about 5-8 degrees high when worn. Large, easy-to-read digits, and you can find them on Ebay for around $100 as well ! (retail $160)

Tom P.

Le 15 août 2005
I still must moderate the remark by confirming that mine has been going worn everyday since the original review. There may be some wrong numbers, but not all have a problem.
Tom P.
Le 15 août 2005

I guess any watch can have runs of "duds". In fact I’ve read a review in which the writer LOVED his Suunto, but had to take back 5 of them before he got one that worked. Also read a review of the HighGear in which he had to "reboot" every two weeks (while mine had not had a single negative issue).

In fact I almost bought the Casio PRG50 before seeing the HighGear Summit (they also have a slightly more compact version, the "Axis"), and at that point had not had the issue with my other Casio Tough Solar watch, along with my friend’s experience with his Casio solar watch, and reading other’s accounts who had similar issues with the battery. I just liked the simpler interface and large graphics of the HighGear.

So, while a solar watch may seem like a great idea (I thought so, I bought one !), I think that for now I’ll stick to regular battery watches, and pay $5 every few years (or decades ?) to have it changed, or, in the case of the HighGear, change it myself for $2 and a few second’s of effort (even in the field).

I appreciate your review, btw, just adding my thoughts and experiences, and I’m glad your Casio is working well.

Kim Singer
Le 20 août 2005

Anyone still looking for a supplier for the CTL 1616 rechargable watch battery should contact Roland at

They are special order, but he can supply them at a cost (currently) of £3.98 each including (UK) postage.

Le 21 août 2005

Hi, I have the Protrek Triple Sensor Illuminator Watch (model# 1170) since 4/1999, changed the first batteries without problems in 12/2001, which now lasted until 8/2005. However, they were already weak for the last year or so, not enough power for altimeter etc, just normal watch operation. Over the last month, the display got so weak, that I could barely read the time, so today I finally replaced the batteries. But now, I don’t seem to get the watch to run anymore. Is there any button to reset after battery change ? I didn’t notice any problems of this nature last time. Or is there some damage to be expected after letting the batteries run dead (almost) entirely ?

Thanks for your help and suggestions, perhaps even from experience with other watches. Cheers,

Le 22 septembre 2005

I had similar problems. It occured to me that the erratic behaviour I was seeing was similar to a crashed computer, so I looked for some sort of re-set.

Checking out the manual showed me there is a ’restart’ button that even my local horologist was unaware of. As he couldn’t fix the watch I though I may as well have a go myself - after all, it couldn’t get any more dead !

If you feel up to it, take your watch apart (or get your horologist to do so), hunt out a tiny (reeeally tiny) switch marked ’AC’ (stands for all clear, I think) and make contact between that and the battery + side for two seconds.

Details are in your 1170 manual, page 55.

Doing that saved me the cost of replacement :-)

Good luck.

Le 27 septembre 2005

I’m something of a Casio collector, I own loads of Casios including loads of Tough Solars. PRG50 I don’t have though.

I’ve got to say I was surprised to read the number of reported poor performances with the PRG50’s battery. All I can say is, I have a quite a few tough solars ranging from new to some of the first ones released and nothing like the problems reported here as ever occured. Example : I’ve had my PRG60T for nearly two years now and not managed to make recover even appear.

One thing strikes me about PRG50, and that’s the very small charging panel surface area compared to other models. I find it hard to believe, but is it possible the battery is being undercharged ?

Le 28 septembre 2005
For the number of poor performance reports, it is normal, it is a one of the few places on the net where there are some and it is likely to attract more. It does not mean that there are a lot of problems like that.
Le 13 décembre 2005
Does any one no if it is possible to fit a new battry to Casio PRG50 my self or do i need special tools
Le 18 décembre 2005
I just bought this prg50T 7ver yesterday at half price. it was listed for €269 and i paid €134.50. I’m quite pleased with the watch overall but the altimeter is useless as it reads -5 or -10 meters when in fact I’m in Paris and we are at about 35 meters above sealevel. pitiful. also the thermometer only works when the watch is OFF your wrist (for 20 to 30 minutes), otherwise your bodyheat interfers with the reading. pitiful as well. (i just hit the altimeter and now i’m 20 meters below sealevel. how nice.
Le 18 décembre 2005

The altimeter gives a relative altitude which is function of the air pressure. air pressure changes with weather, so altitude will change also. One day the same place will be at 100, tomorrow at 0, pressure is dropping, storm is coming ;-). It is however extremely useful when hiking, as the reference altitude is not as interesting a value as the difference between start and end point, and this works without calbration.

To obtain a valid altitude you need to calibrate to a place whose you know the altitude. then all moves from that point will be exact provided the weather does not change to much.

You can calibrate by knowing the barometric pressure at sea level, or the altitude... The best is to calibrate for the average air pressure of the place you leave. Arround 1014 in Nice, 1018 in summer, dunno for Paris.

Indeed, the temp captor will give the temperature of the watch, I do not really see how it could do otherwise ?

Le 21 décembre 2005

Thanks for your response. The altimeter on this watch works not only in conjunction with the barometric pressure, but also with the ambiant air temperature which it factors in, thinking that as you go up the air gets cooler. Not a great idea — other watches such as those in the Sunnto line do not rely on temperature to calculate altitude. Good idea. Having said all of this the altimeter does seem to work if the watch is left on my wrist and i calibrate it to a known altitude. (There are several points in Paris with the altitude marked on a metal sign posted in the street so this is easy to do.)

As for the temperature, i’m sure that there could be some way for Casio to do an instant reading of the air temperature and not that of the watch. Medical professionals have tools to take human temperature instantly using small laser beams, I think. Casio needs to work on this one, it can be done.

The barometer, however, is amazing, and works a charm. A very nice feature and the graph is great.

I needed two links taken out of the titanium strap (they must build these straps to fit the wrist of full grown gorillas) and I went to an authorized Casio shop at 25, rue du Temple in the 4th arrondissement of Paris. They took out the two links in under 60 seconds and didn’t charge me anything. Unheard of !

One more thing : the battery indicator has been at half since I bought the watch. No change. A bit odd, I hope it will charge up.

Le 22 décembre 2005

Yes, on the recent Sunnto, the altimeter and barometer a re temperature compensated.

For the battery, mine is often on half charge in winter, mainly because when I am out I have long sleeves that cover the watch, so it rarely sees the sun directely. Can it be the case for you ?

All the best, /JM

Le 22 décembre 2005

Well I’m glad to hear that I am not the only one with the battery charged only half way. It’s true that when I’m outside the watch is hidden by the long sleeves of my long black overcoat and therefore sees no direct light. I do however try and keep it in the light as often as possible.

This watch continues to function flawlessly and despite its large size it’s very comfortable to wear and surprisingly light.

I hope that Casio will also have different languages to choose from in the future instead of only using English for the days of the week. That would be easy to do, all portable telephones have this feature, why not watches ?

One other minor disappointment is the poor time-keeping accuracy of this watch : the manual warns that this watch may loose up to 15 seconds per month. Wow. When I bought the watch I calibrated the time to the BBC and we shall see how long it takes before the watch is "off" by 15 seconds or more.

Le 10 janvier 2006
In your review you state the Casio rates the rechargeable battery life expectancy at 10 years. Casio also makes a battery only version of this watch (no solar) with a 10 year battery life. What would be the advantage to solar ? If anything, doesn’t the extra complexity of adding solar cause more problems with no benefit, because with either watch, you’ll need to change the battery in 10 years ? I am in the market for this watch but can’t decide if there is any benefit to solar. Now, if the solar charged up a capacitor that had a 50 year life, then it might be a different story. Any thoughts ?
Le 11 janvier 2006

Hi Frank & all,

Precisely the interesting point ! What is the Casio watch model no. that is the equivalent of this solar powered model ?

I am a fan of all watches that do not require a change of batteries. Problem is, I don’t think it exists !

I thought I had the ultimate watch in my Citizen Eco-Drive. Try finding a watch that was solar powered, WR 200m (diving specs), solid titanium (bracelet & case), had chronograph functions (stop watch 1/10th of a csecond), full date/mth auto correcting (not perpetual though) and did all that via analog hands, (more classy/serious-looking). But recently it stopped working and one of the buttons could be pulled out completely. Citizen wants to charge me the price of about 30 pounds for full internal servicing (includes full replacement of any internal parts required, including rechargeable battery).

I have an automatic chronometer Tag Heuer but let’s face it, like all Rolexes, the best Swiss certification of accuracy they give you in the form of a fancy certificate don’t make them anywhere as accurate as a quartz watch.

Furthermore, its beginning to slow now and the Louis Vitton (group that owns the Tag Heuer brand) service centre tells me the lubrication has dried. I find it ridiculous that they want to charge me an overhaul/oiling fee (every 3-5 years) equivalent to that of a brand new Casio Protrek or Casio Seapathfinder !

Now I see ebay selling these Casio solar powered watches and think it may be time to get one. But I found a cheap Casio Seapathfinder with a 10 yr battery life for less than 1/10th the price of these solar powered ones and think... what’s the whole bloody point if any of the "no-battery-change-needed" watches can’t last 10 yrs ?

I’m not saying the cheap watch with a 10 yr battery life will last 10 years. They may go bust much earlier but at least you do not look stupid financially when they do.

What do you guys think ?

Le 12 janvier 2006
I was wrong, after further research the battery life of the Pro Trek is 18 months, depending on use. The battery model Pro Trek has the 40T-7V designation. I confused it with one of their G Shocks with the 10 year battery life. Still, the principal point is the same. I have a Seiko Kinetic Arctura that has a capacitator, which has an indefinite life. Of course, anything with moving parts can’t last forever but I would imagine the hands mechanism will last quite a long time. I just don’t like changing the battery every 1-3 years.
Frank from AZ USA
Le 12 janvier 2006

First, sorry if I replied twice, but my first reply seems to have disappeared.

I was mistaken as to the battery life of the Pro Trek battery model, which is model PRG-40 3VER. The battery life is only 18 months under normal use. Apparently the additonal functions require more energy than some of the G-Shock watches. I confused the Pro Trek with one of those 10 year battery life G-Shocks. Still, the point remains. It would be nice to have a watch be able to go 20-30 years before it wore out. Maybe I am asking too much as 10 years is a long time !

Le 12 janvier 2006

Ok, to be fair, as a watch connoisseur and outdoor lover, I’ve found this site quite a gem, so I feel the need to add/amend somethings.

I have an answer for my own question - What is the purpose of a Solar watch if it can’t last 5-10yrs without any servicing ?

Only if you have a need for a feature set that has high power/current requirements ! A solar panel and rechargeable battery is the only way to power up the suckers. Eg. electro-luminiscent screen (that lights up screen like a X’mas tree they drain the hell out of your lithium batteries), digital compass, thermometer, pressure/altimeter/depth meter readings, memory bank and so on.

If its accurate time-keeping and diving, I am losing my faith. Any quartz watch will do and if the waterproofing rubber seals go, or if you accidentally operate some chronograph buttons while underwater, your financial loss is minimised.

While we’re at it, can somebody tell me why nobody has thought of using synthetic silicone seals for the watches ? Rubber ages and deteriorates. Silicone has proven to be virtually chemical resistant (eg. chlorine), much stronger and durable, as seen in swimming caps, goggles and scuba diving mask straps and seals. Are they ripping us off by making us go back to them every 1-2 yrs ? Cos LV made me do that ! & every manufacturer scares u with this in their fine print.

P.S. Also, I’m a sucker for proper spelling, so, its "Louis Vuitton".

Le 16 janvier 2006

All watches with altimeters need to be calibrated, you’ll have to thank variation in air pressure for that. Any weather you might have experienced in your life is also largely dependent on this air pressure. If you’re out camping and the altimeter registered 200m before you went asleep and it reads 400m when you wake up, there’s a good chance the weather will worsen.

I recall every Casio quartz I’ve ever owned having that 15 second a month disclaimer (correct me if I’m wrong but it doesn’t say it will lose 15 seconds, it just says accuracy : 15 seconds a month, or something along those lines)

You have to be realistic. If you want a better altimeter watch, buy a Suunto. If you want a more accurate timepiece buy an Omega megaquartz 2400. If you want something with a laser thermometer... I’m not sure what to reply to that.

Le 10 février 2006

I bought the analog, black titanium solar version of this watch, PRG-60TY. I am so far extremely pleased with this watch. Although huge it is very light. I have a couple of small complaints : the compass bearing indicators are very small and hard to see, between 4 and 8 o’clock the analog hands are over the digital time display, which makes both hard to read, there is luminescent material on 3/4 of the outer ring markings, none on the analog hands, when setting the analog time, you cannot move the hands counterclockwise : meaning that on time zone changes you’ve got to advance it fully. Other than these minor quibbles, I highly recommend this watch. Not sure how the black finish will hold up in harsh use, have my first backpacking trip next month.


Le 10 février 2006


I am interrested by the CASIO Pro Trek PRG-70-3V witch is smaller. I am curious to know your opinion about this watch.


Le 10 mars 2006
One Month Report I’ve had the watch for one month now. Recall I have the PRG50 Black Titanium version. I have one major complaint in addition to the very minor quibbles I posted earlier. The black titanium finish is not durable. I already have visible wear streaks on the band near the clasp. I work in an office environment and the wear is merely from daily use : no harsh outdoor use at all. The wear streaks are from my arm resting on my desk either writing or typing. One expects a finish to withstand the unrigors of desk work. Other than that, the watch is great !
Le 16 mars 2006

I just received the Casio PRG-70 titanium Black. Same complaint about the black finish of the band.It won’t last... I can’t use the compass and the light in the same time.. Otherwise, it’s fine enought for me... Thank for the review..


Simon Liew
Le 20 mars 2006


I owned this Casio PRG50-YT watch in May 2003. This is the 1st time I got this "Recover" problem. When ever I press "Lamp" button, its start apprear "Recover". When I press on others button like "Compass", "Barometer" & "Altimeter" it show "ERR".

May I ask is it the time to change or replace a new battery ?


Russell Singleton
Le 10 avril 2006

Dear All,

I have a Casio PRG50 Titanium Pro Trek Watch suffering from battery problems. I have opened the back and removed the battery then charged it out of the watch. Upon placing the battery back into the watch I accidentally knocked one of the four gold contact springs out of it’s hole. I cannot work out which hole it should sit in as there are at least 10 empty holes in the white plastic inner watch assembly. I would be very grateful if anyone would be so kind as to take a digital image of the back of their PRG50 with the back removed so I can reinsert the unseated spring.

Many thanks in advance to anyone who can offer assistance.


Russell Singleton

Le 2 mai 2006

I have owned my PRG-50 since summer of 2003 when I purchased it off the net and had it sent to me in Iraq. It survived the harsh conditions quite nicely and has performed many of its functions dutifully.

I am now back in Iraq and needed a new battery (I’m assuming this b/c when the light was pressed it would quickly turn off and "recover" would show, though all other functions seemed to work fine). My wife took it to be serviced and the person didn’t know what they were doing and even gave her the wrong battery (not rechargable), but thankfully did not install it.

Now, my watch constantly reads "OPEN" and I can’t seem to get it to go away, even after opening and reclosing it.

I do not, however, see any springs that I saw someone remark on - do I have/need those ? And where would they be ?

If not, how do I get the "OPEN" message to go away ?



Russell Singleton
Le 5 mai 2006

Hi Byron,

I believe that the purpose of the four gold contact springs is two fold. Firstly to make a connection to the piezo sounder on the inside of the watch back (used for beeps, alarms and hourly chime signals) and secondly to allow the watch to identify whether the watch back is currently removed. If I am correct, then without these springs in place your watch will constantly show "OPEN" even when the back is closed (screwed down correctly). Can any one else on the site confirm my understanding ?

I am certain that they will have been fitted when the watch was manufactured and if this is the first time the watch has been opened, it is possible that the springs may have fallen out whilst the watch back was removed.

Have you returned to the person who opened the watch to attempt the battery change and asked them if they have the springs ? Did you open the watch before your wife took it to them ? If not then the springs are most likely with them. If you did, then maybe they are on your desk/floor etc. ?

Perhaps we can joinly request assistance from other members of the site to provide the photo we both need to reinsert the springs.

Once again, many thanks in advance to anyone who can offer assistance - it is greatly appreciated.


Russell Singleton

John C.
Le 9 juillet 2006

Hi. I was having the same problems with my Pro-Trek that others have reported regarding various functions not working after some time. This was due to the rechargeable battery failing after just a year and a half. I bought a replacement battery (Panasonic Battery CTL1616) from American Perfit in N.Y. ( and its been working fine ever since. The trickiest part was reinstalling the rubber gasket as the rubber seems to expand after opening the watch. I want to buy a brand new gasket and if anyone can tell me where to buy it I would appreciate it. As other have mentioned you have to be careful not to loose the four tiny springs when you open the watch. I photographed the springs and I’ll email anyone the photo if you will send me your email address (I don’t see any place to attach a file to this reply).

Cheers, John C. (

Le 19 juillet 2006
well now we have casio prg 80 and 90 .these have same functions as prg 50 plus timer ,stop watch and world time,also these newer protrek tough solars are reported to have better battery performance than prg 50 model ,which had some problem with loss of rechrage capacity of solar batteries after some time so i recommend prg 80 and 90 ,both great warches
Le 15 août 2006
Hi all just want to say i got about 2.5 years out of my ctl1616 batt. and it is a work watch the watch is a pag50-1v same mod sec as pro-tec don’t think much of batt life when casio pumps up solar and how it lasts all i know i have a g-shock that is over 20 years old did 3 batt changes in that time never had a problem and 2 dollars U.S. a pop not bad so i guest the Harvard mba’s took over casio..........EITHER THAT OR I’M GETTING OLD AND CRANKY
Le 23 octobre 2006

My watch went dead after i failed to expose in into direct sunlight while at the same time repeatedly & recklessly using the 3 functions for atlest 1 month.

I tried to charge it for atleast a week but it keeps on getting dead when hidden from light source.

Does it mean i have to change battery ? if ever, will it retain its water resistance ?

Ajit Singh
Le 28 octobre 2006


Is there a way that I can change the titanium band to a normal resin band. Don’t know where to get the band from and how to change it.

Any ideas would be great.

Thanks, Ajit

Le 22 novembre 2006
My casio prg50 now regularly shows ’half battery’. How do I switch off the ’auto backlight’ ?
Le 29 novembre 2006

Hi, I had the same problem and accdentally switched on the auto-light facility. I lost the manual and found a .pdf file of instructions on the internet :

Basically, push in the light switch for 3 seconds and you should hear a beep and the A-EL function should switch off. I’m going to try and charge up the battery under a bright light source now.

Le 30 novembre 2006

I have a different Casio watch, but they all seem somewhat similar.

First of all, set the watch to normal time mode.

Then press and hold the button at the 1 or 2 o’clock position until the auto light mode changes.

If that works, great. If not look Casio up online and call their help line.

Good luck.

Le 14 janvier 2007

Just found your posting on the casio pro trek watches. Can’t find where one really small spring goes. Is it above the two that are together ?


Le 4 février 2007
Hi author ! Any new updates on the ProTrek PRG-50 ? I also have a ProTrek (PRG-501V) but this model doesn’t have a stopwatch and a countdown timer. I agree this is a tough watch. I even tried putting the watch inside the refrigerator’s freezer for 30mins while running on the barometer mode ! ..just to see if the ProTrek will have moisture inside the lens :)
Le 5 février 2007
Hello, mine is strong and going, so no plan to change it yet....
Le 23 février 2007
I just bought this watch (which I think is less ugly then the newer PAW1200T. However, does anyone have any idea what the tiny numbers are that are printed on the solar ring ? They start at 0 and end at 1300 or so. They are not compass settings.
Le 18 mars 2007
I own this watch and have had no problems with it until it started reading OPEN even though I have never opened it. Nothing works now except the time... Any ideas ???
Le 29 mars 2007

Can anyone tell me how to get the old ctl 1616 battery out of a casio pro-trek watch.


Le 4 janvier 2008
you should buy a better Digital Camera or CameraPhone, Sony Ericsson K-750 have a good macro :)
Le 5 janvier 2008
Sacha : sure, and as if these marvelous sony ericsson were available in mid 2003 !
Le 28 mars 2008

Hello, with all that problems on battery (in spite of beeing a solar-powered watch !) and with the bad accuracy of the altimeter (only 5m steps, nothing changed since 10 years of casio triple sensors with that) I will not think about buying a Casio anymore. They just do not match my idea of a technical delicacy, beeing so expensive.

My Suunto Observer runs on CR2032, the altimeter is precise and reads in 1m- steps and if I want to use the compass at night, the light keeps on shining for 10 seconds (or longer, if you push any button) ! It is great to work with this watch at night.

Le 28 mars 2008

Well, I never had problems with the battery.

For the altimeter, you’ll have to explain me in which terms, except than purely theoritical, an altimeter based on barometric pressure (which changes by the hour), is better with a resolution of one meter than with a resolution of 5 meter ???

Because it simply puzzles me, as still nothing grants that the altitude will be correct, and considering the incertitudes brought by the whole system of measuring the air pressure, 1 meter does not matter, unless you spend your time calibrating, in which case, you’d better buy a GPS, not a watch...

and Suunto have their own problems too, in particular, an observer is HUGE (I had one for 2 years before it died), and not particularly resistant. Read the X6 review, and we’ll see what you think of them, I have one in a drawer that is absolutely useless, and has only worked one month, even when using these marvelous CR2032, it would reset everyday, while Suunto customer sevice is ABSOLUTELY USELESS here !

Le 4 avril 2008
Hi, I have a Casio PRG-50 Titanium. I had this watch from 2002 and still it is going fine. Recently, while I moving rubbish, I accidently scratched the the cover that goes around the dial (the one "holds" the transparent glass/plastic). It is minor but noticeable. I would appreciate if anyone could tell me where to get spare parts for these watches ? Thanks for your help in advance.
Le 21 avril 2008

Hi all...

I have problem a with my Casio PRG-50, bought 2 years ago and just replace the battery 2 months ago, the problem is when i press compass button the arrow reading appeared in wrong direction, its supposed to show to the north direction as i compared to my manual compass, sometimes it show to northeast or northwest can anyone help me please. email me if you can at sorry for broken english. TQ

Le 10 mai 2008
This model of casio is weak about the battery. If your use is urban (i.e. without to recharge it) the battery last very short ! Even if you replace the battery the new one last only 3 or 4 months !!!
Le 1er juin 2008
I have a 3-4 year old Casio Protrek PRG 50. The watch works fine except for the light which no longer works. Any ideas re is it repairable and cost ? Thanks
Le 21 juin 2008
Thanks for the AC ground to + battery tip. It’s actually the very tiny gold dot just above the AC on the next level down that does the trick after 2 seconds. My Casio 1150 had been sitting for over a year after I replaced the batteries and couldn’t figure out why it didn’t work. Thanks
Le 1er septembre 2008
My PRG 50 is abt 18months old , has suddenly displayed the message "open", the back has never been off, just had normal usage. Any suggestions anyone ?????
Le 7 octobre 2008
Hi. I own the PRG60. The CTL1616 went dead two years back. As the CTL1616 was difficult to purchase from the local store, I changed it with non rechargable CL1616. The watch functioned well until the CL1616 ran out of battery last month. After installing a new battery, the watch doesn’t work anymore ! It can’t even be set( even though the digital display and analog hands still run). Only just recently that I discovered that the CL1616 is 3V whereas the CTL1616 is 2.3V !! What should be done ? Please help.

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