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Setting the North Reference
You can set the directional reference used in calculating heading information.
1 Hold MENU.
2 Select Sensors & Accessories > Compass > North Ref..
3 Select an option:
• To set geographic north as the heading reference, select True.
• To set the magnetic declination for your location automatically, select Magnetic.
• To set grid north (000º) as the heading reference, select Grid.
• To set the magnetic variation value manually, select User, enter the magnetic variance, and select Done.
Altimeter Settings
Hold MENU, and select Sensors & Accessories > Altimeter.
Calibrate: Allows you to manually calibrate the altimeter sensor.
Auto Cal.: Allows the altimeter to self-calibrate each time you turn on GPS tracking.
Elevation: Sets the units of measure for elevation.
Calibrating the Barometric Altimeter
Your device was already calibrated at the factory, and the device uses automatic calibration at your GPS
starting point by default. You can manually calibrate the barometric altimeter if you know the correct elevation.
1 Hold MENU.
2 Select Sensors & Accessories > Altimeter.
3 Select an option:
• To calibrate automatically from your GPS starting point, select Auto Cal., and select an option.
• To enter the current elevation manually, select Calibrate > Yes.
• To enter the current elevation from the digital elevation model, select Calibrate > Use DEM.
• To enter the current elevation from your GPS starting point, select Calibrate > Use GPS.
Barometer Settings
Hold MENU, and select Sensors & Accessories > Barometer.
Calibrate: Allows you to manually calibrate the barometer sensor.
Plot: Sets the time scale for the chart in the barometer widget.
Storm Alert: Sets the rate of barometric pressure change that triggers a storm alert.
Watch Mode: Sets the sensor used in watch mode. The Auto option uses both the altimeter and barometer
according to your movement. You can use the Altimeter option when your activity involves changes in
altitude, or the Barometer option when your activity does not involve changes in altitude.
Pressure: Sets how the device displays pressure data.
Calibrating the Barometer
Your device was already calibrated at the factory, and the device uses automatic calibration at your GPS
starting point by default. You can manually calibrate the barometer if you know the correct elevation or the
correct sea level pressure.
1 Hold MENU.
2 Select Sensors & Accessories > Barometer > Calibrate.
3 Select an option:
• To enter the current elevation and sea level pressure (optional), select Yes.
• To calibrate automatically from the digital elevation model, select Use DEM.
• To calibrate automatically from your GPS starting point, select Use GPS.
92 Customizing Your Device
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