Garmin eTrex Summit Owner's Manual And Reference Manual page 51

The amount of declination changes as you move
around the earth. Magnetic North is the direction in
which a compass needle points. Due to errors introduced
when map makers flatten the earth' s sphere onto paper,
not all of the grid lines drawn on the map point exactly to
the north pole, so the north indicated by the grid lines is
called 'Grid North'. But, the difference is usually small
enough that 'Grid' north can be considered the same as
True North for travelling on land. If necessary, you can
correct for the difference between Grid North and True
North manually. The eTrex Summit will reflect the North
Reference setting when using the GPS or Electronic
F
Compass for a bearing.
The Electronic Compass will reflect the North
Reference setting. If you have selected 'TRUE
NORTH' the Electronic Compass will point
'TRUE NORTH' not Magnetic North.
To change the North Reference:
1. With the 'MENU' page displayed using the UP or
DOWN button highlight 'SETUP' and press ENTER.
2. Using the UP or DOWN button to highlight
'HEADING' and press ENTER. The 'HEADING' Page
appears.
3. Using the UP or DOWN button select the 'NORTH
REF' field and press ENTER.
4. Using the UP or DOWN button select the desired
reference. Press ENTER. Press PAGE to return to
the page of your choice.
When you select the 'DEFAULTS' field and press
ENTER the 'UNITS' page returns to the factory settings.
UA-1005.051
Reference
North
Reference
The eTrex Summit
automatically adjusts the
declination. While it shold
rarely be needed the user
can manually adjust the
declination.
To manually set the
declination highlight the
declination field, press
ENTER, and enter a new
declination angle.
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