Mitsubishi ECLIPSE Owner's Manual page 215

Features and controls
2. When the ignition key is in the "ON" position, simulta-
neously press the "H" button and "M" button. Release the
"H" button and "M" button within 10 seconds, and the
electronic compass will switch to its compass setting
mode.
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3. With the electronic compass in its compass setting mode,
press the "M" button to cause the display (A) to show the
zone number that is set.