Magnetic Var - Apollo 920 GPS User Manual

Magnetic Variation
This option allows you to override automatic
magnetic variation and manually enter a
variation value. This is normally not required
for navigation anywhere in the world except
near the poles, where magnetic variation is the
greatest.
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If manual entry of magnetic variation is
necessary, obtain the correct value from a
reliable chart or other source. Select "Manual"
and enter the variation value east or west.
To disable magnetic variation, select "True."
All course headings will show referenced to
true north.