Casio PRG-140 (Module 3144) User Manual

Battery

If the display becomes dim or the backlight fails to illuminate, the battery needs replacement. Please visit an authorized CASIO dealer or distributor. The battery included with your watch is for initial testing purposes and may have a shorter lifespan than a standard battery.

Water Resistance

Watches are classified into water resistance categories from I to V. Refer to the table below to understand the usage rules for your watch.

Notes for specific categories:

• Category I: Not water resistant. Avoid all contact with water.
• Category III: If exposed to salt water, rinse thoroughly with fresh water and dry.
• Category IV: If exposed to salt water, rinse thoroughly with fresh water and dry.
• Category V: Can be used for scuba diving (excluding depths requiring a helium-oxygen mixture).

❗ For all watch categories, do NOT:

• Press buttons underwater.
• Set the time underwater.
• Unscrew the crown underwater.

⚠️ IMPORTANT!

Some water-resistant watches have leather straps. Do not wear these watches while swimming or engaging in any other activity where the strap may be submerged in water.

Care for Your Watch

• Replace the gasket (which protects against water and dust) every 2-3 years.
• If water enters the watch, have it checked immediately by a CASIO dealer or distributor.
• Avoid exposing the watch to extreme high or low temperatures.
• While designed for normal use, avoid rough handling and dropping the watch.
• Do not fasten the strap too tightly. A finger should fit between your wrist and the strap.
• Clean the watch and strap with a dry, soft cloth, or a soft cloth dampened with a mild neutral detergent solution. Never use volatile solvents (e.g., gasoline, thinners, aerosol cleaners).
• Store the watch in a dry place when not in use.
• Avoid contact with gasoline, cleaning solvents, aerosol sprays, adhesives, paint, etc. Chemical reactions with these materials can damage gaskets, the case, and the finish.
• Some models feature silk-screened designs on the strap. Clean these carefully to avoid damaging the graphics.

For Watches with Resin Straps...

• A white powdery substance may appear on the strap. This is harmless and can be easily removed by wiping with a soft cloth.
• Sweat or moisture, or storage in high humidity, can damage, tear, or crack the resin strap. To ensure a long service life, wipe the strap frequently with a soft cloth to remove dirt and moisture.

For Watches with Fluorescent Cases and Straps...

• Prolonged exposure to direct sunlight can cause the fluorescent color to gradually fade. If the watch surface gets wet, wipe it dry as soon as possible.
• Prolonged contact with a wet surface can cause discoloration of the fluorescent color. Keep the fluorescent surface dry and avoid contact with other surfaces.
• Rubbing a surface with fluorescent paint against another surface can transfer the paint.

Setting the Time

1. In Current Time Mode, press and hold button "A" until the city code flashes, indicating the start of settings.
2. Press button "C" to cycle through the following settings: City Code – Daylight Saving Time (DST) – 12/24 Hour Format – Seconds – Hours – Minutes – Year – Month – Day – Power Saving System – Temperature Unit – Altitude Unit – Pressure Unit – City Code.
3. To set seconds: If seconds are flashing, press button "D" to reset to 00. If seconds are between 30-59, pressing "D" resets to 00 and advances the minutes by one. If seconds are between 00-29, the minutes remain unchanged.
4. To set minutes, hours, etc.: Use button "D" to increase and button "B" to decrease the selected value.
5. The day of the week is set automatically based on the date.
6. The date can be set from January 1, 2001, to December 31, 2099.
7. Use buttons "D" and "B" to select the city code.
8. Press button "D" to turn Daylight Saving Time (DST) ON or OFF.
9. Press button "D" to switch between 12-hour and 24-hour time formats. The "P" indicator shows PM in 12-hour format.
10. Press button "A" to exit settings.

Backlight

Press button "L" in any mode to turn on the watch backlight.

• The backlight uses electroluminescent panels (EL) whose brightness decreases over time.
• A faint audible signal may be heard when the backlight is on; this is normal and indicates the EL elements are vibrating.
• The backlight may be difficult to see in direct sunlight.
• Frequent use of the backlight reduces battery life.

Auto-Backlight

The auto-backlight activates automatically when your hand is angled approximately 40° from horizontal. Do not use auto-backlight if it could impair your vision or distract you (e.g., while driving).

To enable/disable auto-backlight in Current Time Mode, press and hold button "L" for 3 seconds. The "A.EL" indicator will appear on the display when it is enabled.

Button Sound On/Off

In any mode, press and hold button "C" for several seconds to turn button sounds ON ("MUTE") or OFF.

Atmospheric Pressure/Temperature Monitoring

Press button "B" to enter Barometer/Thermometer Mode. Measurements take approximately 4-5 seconds.

• Measured pressure is displayed in the center; temperature is displayed at the bottom.
• Pressure readings are in hPa (hectopascals) or inHg (inches of mercury). The measurement range is 260 hPa to 1,100 hPa (7.65 inHg to 32.45 inHg). If pressure is outside this range, "- - - -" is displayed. Readings resume when pressure normalizes.
• Temperature readings are in Celsius (°C) or Fahrenheit (°F). The measurement range is -10.0°C to 60.0°C (14°F to 140.0°F). If temperature is outside this range, "- - - -" is displayed. Readings resume when temperature normalizes.

Atmospheric Pressure Graph

Measurements are taken every 2 hours, starting from the top of the hour. All measured values are displayed on the watch's graph.

1. The graph shows the last 24 hours of measurements.
2. A flashing cursor indicates the most recent measurement.
3. The graph increases or decreases with a pressure change of 1 hPa (0.05 inHg).
4. Some graph segments may disappear if temperature changes sharply; they will reappear when the temperature stabilizes.

The graph display may be affected by:

• Measurements falling outside the allowable range.
• Sensor malfunctions.

Atmospheric Pressure Difference Graph

In Barometer Mode, each new pressure measurement is compared to the previous one, and the difference is displayed.

• Difference readings are shown in +/- 5 hPa increments.
• The difference is not displayed if the measured pressure is outside the allowable range.

Barometer/Temperature Sensor Calibration

The sensor is factory calibrated and does not require user calibration for normal use. If significant inaccuracies occur, recalibration may be performed.

1. In Barometer/Thermometer Mode, press and hold button "A" until "OFF" or the temperature value is displayed.
2. Press button "C" to proceed to sensor calibration.
3. Use buttons "D" (increase) and "B" (decrease) to adjust sensor values.
4. Press buttons "D" and "B" simultaneously to reset to original values.
5. Press button "A" to exit calibration.

Changing Temperature, Pressure, and Altitude Units

1. In Current Time Mode, press and hold button "A" until the city code flashes.
2. Press button "C" to cycle through unit settings for temperature, pressure, and altitude.
3. Use button "D" to select units: Temperature (°C – °F), Altitude (meters – feet), Pressure (hPa – inHg).
4. Press button "A" to exit settings.

Viewing Current Altitude

1. Press button "D" in Current Time Mode to enter Altimeter Mode.
2. The watch will automatically start measuring and displaying your current altitude. Measurement takes approximately 4-5 seconds.

Altitude Measurement Data

If you want to track altitude changes and graphs based on interval or continuous measurements, leave the watch in Altimeter Mode for a period.

• Press button "D" to stop altitude measurements and start anew.
• Altitude data is displayed in 5-meter (20-foot) increments.
• The measurement range is -700 to 10,000 meters (-2,300 to 32,800 feet). Readings outside this range will show "- - - -".
• You can select altitude units (meters or feet).

❗ To exit Altimeter Mode, press button "C".

Altitude Measurement Type Selection

1. In Altimeter Mode, press and hold button "A" until "OFF" or a set altitude value is displayed.
2. Press button "C" twice to access measurement type settings. The display will show "0'05" or "2'00".
3. Press button "D" to select "0'05" (short interval) or "2'00" (long interval).
4. "0'05": Measurements are taken every 5 seconds for one hour.
5. "2'00": Measurements are taken every 5 seconds for the first three minutes, then every 2 minutes for 9-10 hours.
6. Press button "A" to exit settings.

Altimeter Display Format Selection

1. In Altimeter Mode, press and hold button "A" until "OFF" or a set altitude value is displayed.
2. Press button "C" twice to access display format settings. The display will show "1", "2", "3", or "4".
3. Use buttons "D" and "B" to select your preferred display:
   • "1": Altitude graph (top) / Altitude value (center) / Current time (bottom)
   • "2": Altitude graph (top) / Current time (center) / Altitude value (bottom)
   • "3": Altitude difference (top) / Altitude value (center) / Current time (bottom)
   • "4": Altitude difference (top) / Current time (center) / Altitude value (bottom)
4. Press button "A" to exit settings.

Saving Altitude Measurement Data

To start saving data, press and hold button "D" until the "REC" indicator appears. All measured data (year, month, day) is automatically saved to the watch's memory. The "REC" indicator will stop flashing, and the watch will return to Altimeter Mode. The watch can store up to 40 data entries. If the memory is full, older data is automatically deleted to make space for new entries.

❗ To stop data saving, press button "D". The "REC" indicator will disappear.

Periodic Records

The watch can store up to 40 periodic records for a single session.

• Periodic records are created every time data saving begins.
• Each record includes the month, day, measurement time, and altitude value.
• Records are created hourly (by number) and include measurements at the start of the hour, and at 15, 30, and 45 minutes past the hour.
• After 40 periodic records are saved or when measurements stop, a final periodic record is created.

Current Records

Current records contain the following data: Maximum altitude ("MAX"), Minimum altitude ("MIN"), Total ascent for the current session ("ASC"), Total descent for the current session ("DSC").

• Maximum ascent or descent is 99,995 meters (99,980 feet).
• Current record data is created automatically when measurements begin, overwriting the previous current record.
• Data measurement and saving depend on whether the watch is in Altimeter Mode or not.

When the watch is in Altimeter Mode:

• Short interval (0'05): Data updates every 5 seconds.
• Long interval (2'00): Data updates every 2 minutes and at the start of the hour, plus 15, 30, and 45 minutes past the hour.

When the watch is NOT in Altimeter Mode:

• Data updates every 2 minutes and at the start of the hour, plus 15, 30, and 45 minutes past the hour.

Inputting Relative Altitude

By inputting data such as the elevation of the first floor or a base camp, and using atmospheric pressure data, the watch can calculate your current altitude more accurately.

Viewing Periodic and Current Records

In the Altimeter Logbook Mode, use buttons "D" and "B" to select records: Periodic records (REC 1 – REC 40) or Current records (MAX – MIN – ASC – DSC). Press button "C" to exit Logbook Mode.

• If the record data is missing or an error occurred during measurement, "- - - -" will be displayed.
• If the total ascent or descent exceeds the allowable range (99,995 meters / 99,980 feet), the measurement restarts from zero.

Altitude Graph

You can view all measured altitude data on the altimeter graph. The horizontal axis represents measurement time, and the vertical axis represents altitude in 10-meter (40-foot) increments.

Altitude Difference Graph

On the right side of the display, the difference between the relative altitude and the current altitude is shown.

• Difference is displayed in 5-meter increments.
• The difference range is -3,000 to 3,000 meters (-9,980 to 9,980 feet).
• If you selected display format 3 or 4, altitude measurements must be taken separately.

Resetting Altitude Difference to Zero

In Altimeter Mode, press button "A". After a short time, "0" will appear instead of the difference value.

Using Altitude Difference

After resetting the relative altitude to zero, you can calculate the difference between your current location and a subsequent ascent/climb point.

1. In Altimeter Mode, ensure the altitude difference is displayed.
2. Use contour lines on a map to estimate the difference between your current location and the ascent point.
3. Press button "A" to measure the altitude.
4. The display will show the difference between your current location and the ascent point.

Altimeter Logbook Mode

In this mode, you can view all saved data from Altimeter Mode. When periodic data is saved, and the watch displays maximum or minimum ascent/descent values, the current time and date alternate at the bottom of the display.

Periodic Records

You can view up to 40 periodic records from the last measurement session.

Current Records

Current records contain: Maximum altitude ("MAX"), Minimum altitude ("MIN"), Total ascent ("ASC"), Total descent ("DSC") for the selected record.

Viewing Current Time in Another City

In World Time Mode, use buttons "D" and "B" to select the city whose time you wish to view.

Daylight Saving Time

1. Use buttons "D" and "B" to select the city for which you want to change DST settings.
2. Press button "A" to turn DST ON or OFF for that city.

World Time City Codes Table

Measuring Split Times

D (Start) – D (Stop) – D (Restart) – D (Stop) – B (Reset).

Measuring Time with Split Results

D (Start) – B (Split time. SPL indicator appears) – B (Restart) – D (Stop) – B (Reset).

Dual Finish

D (Start) – B (Lap. First finisher's time displayed) – D (Stop. Second finisher's time displayed) – B (Cancel Lap. Second finisher's time displayed) – D (Reset).

Setting an Alarm

1. In Alarm Mode, use buttons "D" or "B" to select the alarm type: ALM1 – ALM2 – ALM3 – ALM4 – ALM5 – SIG (hourly chime).
2. After selecting the alarm type, press and hold button "A" for 3 seconds. The hour digits will flash, indicating they are ready for setting. The alarm automatically turns ON at this point.
3. Press button "C" to cycle through Hours – Minutes.
4. Use buttons "D" and "B" to adjust the selected value.
5. Press button "A" to exit settings.

Checking Alarm Sound

In Alarm Mode, press button "D" to test the alarm sound.

Alarm/Hourly Chime On/Off

1. In Alarm Mode, use buttons "D" or "B" to select the alarm type.
2. Press button "A" to turn the alarm/chime ON or OFF.
3. The "ALM" indicator appears on the display for regular alarms.
4. The "SIG" indicator appears for the hourly chime.

Battery Charge Indicator

The battery charge indicator is located at the bottom of the display. If the indicator is not shown, the battery is fully discharged. Place your watch in a well-lit area.

• Be careful not to expose your watch to direct sunlight for extended periods, as this may cause malfunctions.
• If you frequently use the backlight or alarms, the "LOW" indicator may appear, signaling that the battery needs recharging.

Battery Charging

After a full charge, the watch will operate normally for approximately 7 months under the following conditions:

• Watch is not exposed to direct sunlight.
• Backlight used for 1.5 seconds/day.
• Alarm used for 10 seconds/day.
• Altitude measurement for 1 hour/month.
• Barometric pressure measurement for 2 hours/day.
• 6 hours of operation per day, with 6 hours in sleep mode.

Exposing the watch to sunlight daily ensures continuous recharging:

Enabling/Disabling Power Saving Mode

1. In Current Time Mode, press and hold button "A" until the city code flashes.
2. Press button "D" 9 times to access Power Saving Mode.
3. Press button "D" to turn the power saving mode ON ("ON") or OFF ("OFF").
4. Press button "A" to exit settings.
5. When the mode is ON, the "PS" indicator appears on the display.

Your watch may also enter sleep mode automatically. To return the watch to normal operation, place it in a well-lit area or press any button.