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.
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Select
> System > Calibrate.
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Select an option:
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To calibrate automatically from your GPS starting point, select Auto Cal..
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To enter the current elevation manually, select .
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To enter the current elevation from the digital elevation model (DEM), select .
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To enter the current elevation from your GPS starting point, select .
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