Casio ProTrek PRG550-1A1CR Multifunction Watch

Priced: $269.95 - $299.95 Rated:   - 4 stars out of 5 by 2 reviews.
Casio ProTrek PRG550-1A1CR Multifunction Watch
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Color: Black
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Casio ProTrek PRG550-1A1CR Multifunction Watch -

The solar-powered, triple-sensor Casio ProTrek PRG550-1A1CR multifunction watch sports easy-to-use features, including a digital compass, altimeter, barometer and thermometer.



  • Tough Solar Power conserves energy, allowing the Casio ProTrek PRG550-1A1CR multifunction watch to power down when not exposed to light for a certain period of time
  • Stainless/resin case is 100m water resistant and works down to 14F


  • 100m (330 ft.) water resistance and a stainless-steel case help protect the watch; resin wrist band is comfortable and durable


  • Depending on the function selected, the second hand can point to magnetic north and indicate changes in atmospheric pressure or altitude from a preselected location
  • 3-hand analog face features an LCD window, bringing together classic timepiece looks with cutting-edge data display capabilities
  • LCD window displays numerical sensor information such as compass direction angle value, altitude, atmospheric pressure and temperature
  • Chronograph includes a countdown timer and stopwatch that tracks to the 1/100th of a second
  • Digital compass with needle display keeps you on course
  • Features include a countdown timer, 1/100 second stopwatch, time in 12- or 24-hr. format, world time with 29 time zones, 5 daily alarms and hourly chime
  • LCD display's backlight illuminates the watch after dark, and activates with a flick of the wrist
  • Also functions as a regular watch with five daily alarms, standard and military time settings, and times for 29 cities
  • Triple sensors measure compass bearing, altitude/atmospheric pressure and temperature
  • Altimeter features automatic memory and records up to 25 logs with high/low/total altitude, date, and time so you can keep track of your ascents and descents
  • Tough Solar Power, battery indicator, and rechargeable battery means you don't have to worry about battery replacement
  • No batteries to replace! Efficient, large-capacity solar battery requires very little light to recharge and lasts up to 6 months without recharging
  • Thermometer displays temperatures between 14F and 140F and the barometer warns of approaching storms with its atmospheric pressure measurements and graphs
  • Full auto LED light activates with a quick flick of the wrist, allowing you to check data and take readings with ease (Fall 2014)

Don't be fooled by the classic analog look of the Casio Pro Trek PRG550-1A1 Altimeter Watch; behind that pretty face lurks an altimeter, compass, barometer, thermometer, and full-featured watch. As rugged as it is feature-packed, this new member of the Triple Sensor family runs on Tough Solar Power technology that recharges every time you take it out into the light.

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Average Price History: Price History
Review RatingNumber of Reviews
Altimeter/barometer lock:No
Altitude alarm:No
Analog or Digital:Both
Ascent/descent rate:No
Average battery life:6 months
Construction:Stainless steel
Countdown timer:Yes
Date display:Yes
Dimensions:2.24 x 1.94 x 0.56 inches
Elevation gain/loss:Yes
Elevation scale:5 meters
Face diameter:Unavailable
Lap timer:Yes
Multiple time zones:Yes
OS compatibility:No
Tide tracking:No
User replaceable battery:No
Watch band material:Resin
Water-resistant depth:100 meters
Weather forecast:Yes
Wireless communication:No

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Casio ProTrek PRG550-1A1CR Multifunction Watch Reviews:


Nice watch

Not quite as light or comfortable as the Suunto Core but offers an analog face/hands which I prefer. Seems plenty accurate as long as you remember to reset your reference height every day or two. The operation manual is a little involved but the design of the watch and the way that Casio engineered the seconds hand to also act as an indicator for the Alt./Bar./Comp. is really impressive. I have small wrists and have gotten used to the size just fine (even when bike commuting). The band is stiff on Day1 but you can loosen it by removing the watch and setting it to the tightest setting at night while you sleep OR by dipping the band in boiling water (NOT the watch sensor/body)to soften the rubber. If the band were more comfortable I'd give it 5*. The solar battery is really nice too and always registers as "High" with my everyday use. The Suunto night light is nicer but I'm nitpicking now.
izzy papa at REI on 02/02/2013

Altitude Junkie

I loved the idea of using the second hand to serve other functions. And it does this pretty well with the compass mode, whereas most other digital compasses I've seen pretty much stink. Of course, the delay in 'needle' movement make it less useful.

Casio also manages to use the needle for barometric pressure readings, albeit in a moderately useful way. Wish there were some cool/practical way to use it for the altimeter, as that's my favorite function of an ABC watch.

Casio's solution to doing both Analog and digital relegates the digital display to being pretty small. So it's hard to read at times.

Love that it's solar powered! Haven't had any trouble with sun exposure, however, the instruction manual did scare me into thinking I had to be diligent about getting enough direct light. Supposedly this shouldn't be an issue, but I've only had this watch for about a month.
New to Trad at REI on 02/02/2013