15.3
Understanding Declination
Topographic maps are drawn to
true north (North Pole), which
is
indicated by the grid lines on
the map. However, a compass will
always point to magnetic north,
which is in the Hudson Bay area.
The difference between true north
and magnetic north is called "declination."
When
true north and magnetic north
are aligned, you’re at zero degrees declination. Your compass needle
will point to true north. However,
if you’re east or west of
zero degrees declination, your compass will
not be in line with true north.
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