Calibrating Altitude - Polar Electro AXN500 User Manual

How Altitude Alarms work
Altitude Alarms work in all main modes. When you reach a preset altitude point, the wrist unit sounds an alarm and the
symbol and text Altitude Alarm! are displayed. Press any button to stop the Alarm.
To prevent the alarm from going off continuously for the same altitude, the wrist unit sounds the alarm again only if you
have ascended or descended at least 10 m / 33 ft before reaching the same preset altitude. In order to use the Altitude
Alarms, you need to activate the altimeter in the Alti main mode.
Tip: The Altitude Alarm function can also be used to help climb or trek safely at high altitudes. Cases of Acute Mountain Sickness (AMS) may occur
at altitudes typically near or above 3 000 m / 10 000 ft or higher. If you are not adapted, or acclimatized, to the altitude, limit your daily rate of
ascent to 300 m / 1 000 ft per day to help reduce the risk of AMS. Also monitor your heart rate while ascending to get information about your body's
response to the increased altitude.

3.2.4 CALIBRATING ALTITUDE

There are two ways to calibrate the altimeter: manually, setting a value by scrolling; or with a calibration list, if you have
prepared the list in advance with the Polar Precision Performance software. Calibrate your altimeter often to ensure it
remains accurate. Set the reference altitude whenever a reliable reference, such as a peak or a topographic map, is
available.
Tip: When calibrating the altimeter, the barometer is calibrated simultaneously.
If you do not know the altitude of your position, but you do know the exact sea level pressure of your location, you can calibrate the sea level pressure
to help determine the altitude and vice versa. For further information on the barometer calibration, see page 44.
Note: Every time you calibrate the altitude value and the Action recording is on or paused, a Marker is recorded automatically.
MEASURING AND RECORDING WITH YOUR OUTDOOR COMPUTER 41