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Because a compass points to Magnetic North, not True North, maps indicate the difference
between True and Magnetic North with a measurement called 'declination'. The amount
of declination changes as you move around the earth. Magnetic North is the direction
in which a compass needle points. When the Geko 301 has your postion (i.e. "Ready to
Navigate"), it corrects for declination when set to 'TRUE NORTH'.
The Geko 301 bearings will correspond to the compass if the Geko 301 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. The difference, however, is usually
small enough that 'Grid' north can be considered the same as True North for traveling on
land. If necessary, manually correct for the difference between Grid North and True North.
If you select User for North Reference, the
the declination. The declination of the Geko 301' s compass is shown to the right of North
Reference.
To change the North Reference:
1. From the MENU Page press the UP or DOWN Button to highlight 'UNITS' and then
press the OK Button to display the UNITS Page.
2. Press the UP or DOWN Button to highlight the 'NORTH REF' fi eld and press the OK
Button.
3. Press the UP or DOWN Button to highlight your selection and then press the OK
Button.
4. Press the PAGE Button to return to the MENU Page.
When you select the 'DEFAULTS' fi eld and press
Page to the factory settings.
fi eld is highlighted for you to edit
'VARIATION'
the OK Button
to return the UNITS
Setup Page
Heading
'MAGNETIC' north is the
default north reference
setting.
Use 'Defaults' to
return to original
factory settings
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