Garmin NavTalk NavTalk GSM Owner's Manual page 104

Section 4
GPS Navigation
GPS Settings
North Reference
Options Menu
Direction Display
Options Menu
Heading Tab
94
Heading Settings Tab
North Reference - Allows control of what the unit considers 'North'.
True - Uses True North. Magnetic - Uses Magnetic North, which is
continually updated based on your current location. Grid - Uses North
as defined by the selected grid. User - Uses the Magnetic North Offset
determined by the value entered in the Magnetic Variation Field.
Magnetic
Variation
Entry Field
Enter data when
User is selected for
North Reference.
Magnetic Variation - Provides the magnetic variation for "Magnetic"
north reference when selected and allows you to enter corrections for
the magnetic variation when using a 'User' based' North Reference
program. "True" and "Grid" north reference selections do not display a
magnetic variation.
Direction Display - Changes the 'Direction To Go' field and Map
Panning box on the Map Page and Find pages from Cardinal Letters
(N, S, E, W) to Numeric Degrees (147
WARNING: If 'User' North Reference is selected, you
must periodically update the magnetic variation as your
position changes. When using this setting, the unit
will not automatically calculate and update the mag-
netic variation at your current location. Failure to
update this setting may result in substantial differences
between the information displayed on the unit and
external references, such as a magnetic compass.
o
).