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To calibrate the compass
1. From the Satellite Page or the Compass Page,
go to MENU > Calibrate > Calibrate Compass.
OR
From the Home Page, go to Settings > Compass
& Altimeter > Calibrate > Calibrate Compass.
2. Follow the on-screen instructions to calibrate
the compass.
Altimeter Calibration
There are three options for calibrating the altimeter.
By default, the device is set to auto-calibrate the altimeter
using GPS elevation; however, manual calibration using
the known elevation or barometric pressure provides
greater accuracy.
Auto-calibration uses the average GPS elevation as a
basis for the barometric elevation. Adjustments are made
to take into account changes over time in the barometric
pressure, unrelated to changes in elevation. As the
elevation adjusts (typically in 2-3 minutes), "Calibrating"
displays in the bottom right corner of the Satellites Page.
If you are using the Elevation: Barometer info eld on any
page, it displays a red exclamation point.
Note that the unit settings used in the Known Elevation
and Known Pressure elds are from the units set on
your device. To change the units, go to Settings >
Units > Pressure.
To calibrate the altimeter
1. From the Satellite Page or the Compass Page,
go to MENU > Calibrate > Calibrate Altimeter.
OR
From the Home Page, go to Settings > Compass
& Altimeter > Calibrate > Calibrate Altimeter.
2. Select a calibration method.
» Known Elevation–The actual elevation
at your location.
» Known Pressure–The barometric pressure
(adjusted for sea level) for your location.
» GPS Elevation–The GPS elevation calculated
by the device.
Additional Information