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Garmin eTrex Manual

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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 a compass if the eTrex
is set to magnetic north. Due to errors introduced when
map makers fl atten 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’ fi eld. Press ENTER. The ‘SETUP’ Page
appears.
2. Press the UP or DOWN Button to select ‘UNITS’.
Press ENTER. The ‘UNITS’ Page appears.
3. Press the UP or DOWN Button and select the
‘NORTH REF’ fi eld. 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’ fi eld and press
ENTER, the ‘UNITS’ page returns to the factory settings.
‘MAGNETIC’ north is
the default north
reference setting.
Reference
Units of
Measure
… 38 …


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