Congratulations upon your selection of this CASIO watch.
The built-in sensors of this watch measure direction, barometric pressure, temperature and altitude.
Measured values are then shown on the display. Such features make this watch useful when hiking,
mountain climbing, or when engaging in other such outdoor activities.
The measurement functions built into this watch are not intended for taking measurements that
require professional or industrial precision. Values produced by this watch should be considered
as reasonable representations only.
When engaging in mountain climbing or other activities in which losing your way can create a
dangerous or life-threatening situation, always use a second compass to confi rm direction
Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any damage or loss
suffered by you or any third party arising through the use of this product or its malfunction.
About This Manual
Button operations are indicated using the letters shown in the
Note that the product illustrations in this manual are intended for
reference only, and so the actual product may appear somewhat
different than depicted by an illustration.
Things to check before using the watch
1. Check the battery power level.
Is "H" or "M" displayed for the battery power indicator?
Does any one of the following conditions exist?
Battery power indicator shows "L" and "LOW" is displayed in the
upper left corner of the screen.
"C" is displayed in the lower left corner of the screen.
The face is blank.
Power is low. Charge the watch by placing it in a location
where it is exposed to light. For details, see "Charging the
2. Check the Home City and the daylight saving time (DST) setting.
Use the procedure under "To confi gure Home City settings" to confi gure your Home City and daylight
saving time settings.
Proper time calibration signal reception, and World Time Mode and Sunrise/Sunset Mode data depend
on correct Home City, time, and date settings in the Timekeeping Mode. Make sure you confi gure these
settings correctly.
3. Set the current time.
To set the time using a time calibration signal
See "To get ready for a receive operation".
To set the time manually
See "Confi guring Current Time and Date Settings Manually".
The watch is now ready for use.
For details about the watch's radio controlled timekeeping feature, see "Radio Controlled Atomic
Charging the Watch
The face of the watch is a solar cell that generates power from light. The generated power charges a
built-in rechargeable battery, which powers watch operations. The watch charges whenever it is exposed
to light.
Charging Guide
Whenever you are not wearing the
watch, leave it in a location where it
is exposed to light.
Best charging performance is
achieved by exposing the watch to
the strongest light available.
Leaving the watch in bright light for charging can cause it to become quite hot.
Take care when handling the watch to avoid burn injury. The watch can become particularly hot
when exposed to the following conditions for long periods.
On the dashboard of a car parked in direct sunlight
Too close to an incandescent lamp
Under direct sunlight
Allowing the watch to become very hot can cause its liquid crystal display to black out. The
appearance of the LCD should become normal again when the watch returns to a lower temperature.
Turn on the watch's Power Saving function and keep it in an area normally exposed to bright light when
storing it for long periods. This helps to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is
blocked from exposure to light can cause power to run down. Expose the watch to bright light
whenever possible.
Operation Guide 3172
Warning !
Battery power
The watch is charged
For details about
charging, see
"Charging the Watch".
Go to step 2.
When wearing the watch, make sure
that its face is not blocked from light
by the sleeve of your clothing.
The watch may enter a sleep state
if its face is blocked by your sleeve
even only partially.
Power Levels
You can get an idea of the watch's power level by observing the battery power indicator on the display.
Battery power
Battery power
The fl ashing LOW indicator at Level 3 (L) tells you that battery power is very low, and that exposure to
bright light for charging is required as soon as possible.
At Level 5, all functions are disabled and settings return to their initial factory defaults. Once the battery
reaches Level 2 (M) after falling to Level 5, reconfi gure the current time, date, and other settings.
Display indicators reappear as soon as the battery is charged from Level 5 to Level 2 (M).
Leaving the watch exposed to direct sunlight or some other very strong light source can cause the
battery power indicator to show a reading temporarily that is higher than the actual battery level. The
correct battery level should be indicated after a few minutes.
All data stored in memory is deleted, and the current time and all other settings return to their initial
factory defaults whenever battery power drops to Level 5 and when you have the battery replaced.
Power Recovery Mode
Performing multiple sensor, illumination, or beeper operations during a short period may cause all of
the battery power indicators (H, M, and L) to start fl ashing on the display. This indicates that the watch
is in the power recovery mode. Illumination, alarm, countdown timer alarm, hourly time signal, and
sensor operations will be disabled until battery power recovers.
Battery power will recover in about 15 minutes. At this time, the battery power indicators (H, M, L) will
stop fl ashing. This indicates that the functions listed above are enabled again.
If all of the battery power indicators (H, M, L) are fl ashing and the C (charge) indicator also is fl ashing,
it means the battery level is very low. Expose the watch to bright light as soon as possible.
Even if battery power is at Level 1 (H) or Level 2 (M), the Digital Compass Mode, Barometer/
Thermometer Mode, or Altimeter Mode sensor may be disabled if there is not enough voltage available
to power it suffi ciently. This is indicated when all of the battery power indicators (H, M, L) are fl ashing.
Frequent fl ashing of all of the battery power indicators (H, M, L) probably means that remaining battery
power is low. Leave the watch in bright light to allow it to charge.
Charging Times
Exposure Level (Brightness)
Outdoor sunlight (50,000 lux)
Sunlight through a window (10,000 lux)
Daylight through a window on a
cloudy day (5,000 lux)
Indoor fl uorescent lighting (500 lux)
*1 Approximate amount of exposure time required each day to generate enough power for normal daily
*2 Approximate amount of exposure time (in hours) required to take power from one level to the next.
The above exposure times all are for reference only. Actual exposure times depend on lighting
For details about the operating time and daily operating conditions, see the "Power Supply" section of
the Specifi cations.
Power Saving
When turned on, Power Saving enters a sleep state automatically whenever the watch is left for a certain
period in an area where it is dark. The table below shows how watch functions are affected by Power
There actually are two sleep state levels: "display sleep" and "function sleep".
Elapsed Time in Dark
60 to 70 minutes (display sleep)
6 or 7 days (function sleep)
The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch is already in a sleep
state when 6:00 AM arrives, however, it will remain in the sleep state.
The watch will not enter a sleep state while it is in the Stopwatch Mode or Countdown Timer Mode.
To recover from the sleep state
Move the watch to a well-lit area, press any button, or angle the watch towards your face for reading.
To turn Power Saving on and off
Power saving
Power saving
on indicator
on indicator
Level Battery Power Indicator
Function Status
All functions enabled.
All functions enabled.
Auto and manual receive, illumination,
beeper, and sensor operation disabled.
Except for timekeeping and the C (charge)
indicator, all functions and display
indicators disabled.
All functions disabled.
Level Change *2
Level 5
Level 4
Level 3
5 min.
2 hours
24 min.
5 hours
48 min.
8 hours
8 hours
87 hours
Blank, with PS fl ashing
Display is off, but all functions are enabled.
All functions are disabled, but timekeeping is
Blank, with PS not fl ashing
1. In the Timekeeping Mode, hold down E until the currently selected
city code starts to fl ash. This is the city code setting screen.
Before the city code starts to fl ash, the message SET Hold
will appear on the display. Keep E depressed until SET Hold
disappears and the city code starts to fl ash.
2. Use D to display the Power Saving On/Off screen shown nearby.
3. Press A to toggle Power Saving on (On) and off (OFF).
4. Press E twice to exit the setting screen.
The Power Saving on indicator (PS) is on the display in all modes
while Power Saving is turned on.
Level 2
Level 1
11 hours
3 hours
54 hours
15 hours
110 hours
30 hours
– – –
– – –


Table of Contents

Summary of Contents for Casio Pro Trek PRW-2000-1ER

  • Page 1 • Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any damage or loss suffered by you or any third party arising through the use of this product or its malfunction. All functions disabled. •...
  • Page 2: Radio Controlled Atomic Timekeeping

    Operation Guide 3172 Radio Controlled Atomic Timekeeping Auto Receive • With Auto Receive, the watch performs the receive operation each day automatically up to six times (up This watch receives a time calibration signal and updates its time setting accordingly. However, when to fi...
  • Page 3: Mode Reference Guide

    Operation Guide 3172 Radio-controlled Atomic Timekeeping Precautions Mode Reference Guide • Strong electrostatic charge can result in the wrong time setting. • Even if a receive operation is successful, certain conditions can cause the time setting to be off by up Your watch has 11 “modes”.
  • Page 4: Confi Guring Current Time And Date Settings Manually

    Operation Guide 3172 To change the Daylight Saving Time (summer time) setting Digital Compass Readings 1. In the Timekeeping Mode, hold down E until the currently selected When you press C to start digital compass measurement, COMP will appear on the display initially to •...
  • Page 5 Operation Guide 3172 To perform northerly calibration To determine the direction angle to an objective on a map and head in that direction 1. Set the map so its northerly indication is aligned with north as indicated Important! by the watch, and determine your current location. If you want to perform both northerly and bidirectional calibration, perform bidirectional calibration fi...
  • Page 6 Operation Guide 3172 Display Units Barometer and Thermometer Precautions You can select either hectopascals (hPa) or inchesHg (inHg) as the display unit for the measured • The pressure sensor built into this watch measures changes in air pressure, which you can then apply barometric pressure, and Celsius (°C) or Fahrenheit (°F) as the display unit for the measured temperature to your own weather predictions.
  • Page 7 Operation Guide 3172 Using the Altitude Differential Value Auto Save Values The Altimeter Mode screen includes an altitude differential value that Two sets of auto save values (Set 1 and Set 2) are maintained in watch memory. Altitude Altitude shows the change in altitude from a reference point you specify. The differential differential Set 1...
  • Page 8: Viewing Altitude Records

    Operation Guide 3172 3. Use A and C to scroll through the screens for an area and display the one you want. There are two standard methods of expressing altitude: Absolute altitude and relative altitude. Absolute altitude expresses an absolute height above sea level. Relative altitude expresses the difference between Altitude Altitude the height of two different places.
  • Page 9: Using The Stopwatch

    Operation Guide 3172 To look up the sunrise and sunset times for a specifi c city code Using the Stopwatch Important! The stopwatch measures elapsed time, split times, and two fi nishes. • You do not need to perform this procedure to look up the sunrise and sunset times in your currently selected Home City.
  • Page 10: Button Operation Tone

    Operation Guide 3172 To set an alarm time To turn the auto light switch on and off 1. In the Alarm Mode, use A and C to scroll through the alarm screens In the Timekeeping Mode, hold down L for about three seconds to toggle Alarm ON/OFF Alarm ON/OFF until the one whose time you want to set is displayed.
  • Page 11: Specifications

    If ERR disappears after about one second, try performing the calibration again. signal) ; Remaining auto receives cancelled as soon as one is successful; Manual receive; • If ERR keeps appearing, contact your original dealer or nearest authorized CASIO distributor to have Receive Mode the watch checked.
  • Page 12 Operation Guide 3172 Site Data List Site Longitude Latitude Site Longitude Latitude Abu Dhabi 54°E 24°N Lisbon 9°W 39°N Addis Ababa 39°E 9°N London 0°E 51°N Adelaide 139°E 35°S Los Angeles 118°W 34°N Amsterdam 5°E 52°N Madrid 4°W 40°N Anchorage 150°W 61°N Manila...

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Table of Contents