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Main Menu Pages
Set Heading Page
You can set the angle units and the North Reference in the Set Heading Page.
Angle: Select the unit of measurement for angles to display in. Highlight ‘DEGREES’ and
press ENTER to display angle units as degrees (360°). Highlight ‘MILS’ and press ENTER to
display angle units in mils, a unit of angle measurement used in military settings, in which
17.78 mils equal one degree.
North Reference: Select the North Reference to match the North Reference used on your
paper map, if you are using one. Select from True North, Magnetic North, Grid North, or
User North. Refer to the following section, “North Reference,” for complete information.
Defaults: Press ENTER to set the unit’s System settings to the factory defaults.
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, 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 a measurement called variation. 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. The difference, however, is usually small enough that
‘Grid’ north can be considered the same as True North for travelling on land. If necessary,
manually correct for the difference between Grid North and True North. If ‘User’ is chosen,
you must correct for the magnetic variation.
Setup Menu: Set Heading
Setup Menu
Set Heading Page
Selecting the angle setting