1. Make sure the watch is in the Timekeeping Mode.
2. Press D to start Altimeter measurement.
• ALTI will appear on the display, indicating that Altimeter measurement is in progress. The first reading will appear on the display after about four or five seconds.
• The current altitude value is displayed in units of 5 meters (20 feet).
• After the first reading is obtained, the watch continues to take altimeter readings automatically every fi ve seconds for the first three minutes, and then every two minutes after that.
• If you leave the watch in the Altimeter Mode, it will update the displayed altitude value regularly.
• Temperature is measured in the Barometer/Thermometer Mode and in the Altimeter Mode. For details about temperature readings, see “Temperature” (page E-24).
3. After you are finished using the Altimeter, press C to return to the Timekeeping Mode and stop auto measurement.
• The watch will return to the Timekeeping Mode automatically if you do not perform any operation for about 10 hours after entering the Altimeter Mode.
Note
The measurement range for altitude is –700 to 10,000 meters (–2,300 to 32,800 feet).
The displayed altitude value changes to – – – – if an altitude reading falls outside the measurement range. An altitude value will reappear as soon as the altitude reading is within the
allowable range.
Normally, displayed altitude values are based on the watch’s preset conversion values. You also can specify a reference altitude value, if you want. See “Specifying a Reference
Altitude Value” below.
You can change the unit for displayed altitude values to either meter (m) or feet (ft). See “To specify temperature, barometric pressure, and altitude units” (page E-39).
Specifying a Reference Altitude Value
The altitude readings produced by this watch are subject to error caused by changes in air pressure. Because of this, we recommend that you update the reference altitude value
whenever accurate altitude information is available during your climb. After you specify a reference altitude value, the watch adjusts its air-pressure-to-altitude conversion calculation
accordingly.
To specify a reference altitude value
1. In the Altimeter Mode, hold down A until the current reference altitude value starts to fl ash. This is the setting screen.
• Before the reference altitude value starts to fl ash, the message SET Hold will appear on the display. Keep A depressed until SET Hold disappears.
2. Press D (+) or B (–) to change the current reference altitude value by 5 meters (or 20 feet).
• Specify a reference altitude value based on accurate altitude information about your current location from a map, etc.
• You can set the reference altitude value within the range of –10,000 to 10,000 meters (–32,800 to 32,800 feet).
• Pressing B and D at the same time returns to OFF (no reference altitude value), so the watch performs air pressure to altitude conversions based on preset data only.
3. Press A to exit the setting screen.
How does the altimeter work?
Generally, air pressure and temperature decrease as altitude increases. This watch bases its altitude measurements on International Standard Atmosphere (ISA) values stipulated by the
International Civil Aviation Organization (ICAO). These values define relationships between altitude, air pressure, and temperature.
CASIO Watch 5450 - e altimeter work
CASIO Watch 5450 - e altimeter work 1
Note that the following conditions will prevent you from obtaining accurate readings:
When air pressure changes because of changes in the weather Extreme temperature changes
When the watch itself is subjected to strong impact
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 the height of two different places.
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