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North Reference
‘Reference’ refers to the orientation of a map’s grid.
Map makers try to align the vertical lines on a map with
‘True North’. True North is the direction from any
location on the earth’s surface to the “north pole”. Maps
are typically referenced to true north. Because a compass
points to magnetic north, not true north, maps indicate
the difference between true and magnetic north with
something called ‘declination’. The amount of declination
changes as you move around the earth. Magnetic North
is the direction in which a compass needle points. The
eTrex bearings will correspond to the compass if the
eTrex is set to magnetic north. 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.
To change the North Reference:
1. Press the PAGE button and switch to the ‘MENU’
page. Use the UP and DOWN button and highlight
the ‘SETUP’ field. Press ENTER. The ‘SETUP’ Page
appears.
2. Press the UP/DOWN button to select ‘UNITS’. Press
ENTER. The ‘UNITS’ Page appears.
3. Press the UP or DOWN button and select the
‘NORTH REF’ field. Press ENTER.
4. Press the UP or DOWN button to 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.
Units of
Measure
You can use GARMIN’S
‘MapSource® Map Data
CD-ROMs to download
waypoints, tracks, and
routes.
‘MAGNETIC’ north is
the default north
reference setting.
Reference