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Compass Calibration for the eTrex SE or eTrex Solar
In order to keep the electronic compass in an eTrex® SE or eTrex Solar outdoor handheld accurate, it needs to be calibrated regularly.
At a minimum, it is recommended to calibrate the compass at first use, when the batteries are replaced (if applicable), and after moving more than 100 miles (160 km), or experiencing a temperature change greater than 68° F (20° C) from the last calibration. However, to ensure the compass is always working properly, you may want to calibrate right before using the device.
Tips
Calibrate the compass outside.
Ensure you hold the device parallel to the ground when calibrating.
Magnetic fields (such as cars, buildings, etc.) can cause poor compass readings, and also interfere with calibrating.
Calibrating the Compass
Press
/
until you reach the main menu.Select Tracking, and press
or 
to scroll to the compass page.Press OK to open the options menu.
Select Calibrate Compass > Start.
Follow the on-screen instructions.
A message will appear to indicate when the calibration has been completely successfully. If the calibration fails at any point, select Retry or repeat the above steps to perform the calibration again.