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Casio Releases New PROTREK Watch
That Displays Compass Bearing, Altitude Difference and
Atmospheric Pressure Tendency with the Second Hand

Analog Face with Three Hands and LCD Equipped with Triple Sensors

  • March 07, 2012


Band color
Accent color

TOKYO, March 7, 2012 — Casio Computer Co., Ltd., announced today the release of the PRG-550, a new addition to the PROTREK line of outdoor watches. The new model displays compass bearing, atmospheric pressure/altitude and temperature using both the second hand and a liquid crystal display.

The PROTREK series of outdoor watches make the most of Casio’s cutting-edge sensor technology to measure various kinds of natural data. This makes PROTREK watches very popular, not only among climbing enthusiasts, but also leisure hikers and car campers.

The new PRG-550 is an analog-face PROTREK model with three hands and an LCD. It is equipped with triple sensors that measure compass bearing, altitude/atmospheric pressure, and temperature. Each of these information types is displayed using both the second hand and the LCD. While the LCD displays numerical information, the second hand points north, indicates the latest change in atmospheric pressure, or shows the change in height from a pre-selected location, depending on the function selected.

Since the hour and minute hands always show the time, while the angle of the second hand gives the wearer an immediate picture of the compass bearing, altitude/atmospheric pressure, or temperature, the watch is very useful for planning the schedule and pace of a climb.

Also equipped with Casio’s Tough Solar charging system that turns light into power for the watch, Neo Bright coated hands that improve visibility even in dim lighting, as well as a high-brightness white LED that clearly illuminates the hands in the dark, the PRG-550 offers a wide range of features that make any outdoor adventure better.


10-meter water resistance; low-temperature resistance (-10°C / 14°F)
Digital Compass
Measures and displays direction as one of 16 points with the second hand; measuring range: 0° to 359°; measuring unit: 1° (shown on the LCD display); 20-second continuous measurement; graphic direction pointer; north pointer; magnetic declination correction; bidirectional calibration and northerly calibration function
Measuring range: 260 to 1,100 hPa (7.65 to 32.45 inHg); measuring unit: 1 hPa (0.05 inHg); atmospheric pressure change indicator (±10hPa); atmospheric pressure tendency graph (past 16 hours graph display)
Measuring range: -700 to 10,000 m (-2,300 to 32,800 ft.) without reference altitude; altitude change indicator (range 1: ±100m / 5m; range 2: ±1000m / 50m); altitude memory (manual memory measurement up to 14 records of month, day, time, and altitude); highest and lowest altitude reading display; auto tracking (ascent/descent) memory; altitude tendency graph display; reading interval setting (every 5 seconds for 1 hour or every 2 minutes for 10 hours)
Measuring range: -10 to 60°C (14 to 140°F); measuring unit: 0.1°C (0.2°F)
World Time
29 cities (29 time zones; daylight saving on/off) and Coordinated Universal Time
1/100-second stopwatch; measuring capacity:59’59.99”; split time
Countdown Timer
Measuring unit: 1 second; input range: 1 to 60 minutes (1-minute increments)
5 independent daily alarms; hourly time signal
Other Functions
Full auto-calendar; 12/24-hour format; button operation tone on/off; full auto LED light with afterglow
Power Source
Tough Solar power system (solar-charging system)
Continuous Operation
About 23 months with the power-saving function* ON after full charge

  • * Display shuts off after a certain period in a dark location
Accuracy at Normal Temperature
±15 seconds per month
Size of Case
56.8 × 49.3 × 14.4 mm
Total Weight


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