Garmin GPS 12MAP - Manual (Page 84)

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REFERENCE
Setup Menu:
Units
Select nautical, statute
or metric units of mea-
sure from the ‘Units’ set-
tings.
The ‘User Mag’ option
allows you to define the
magnetic variation for
your area. ‘Auto Mag
Var’ is the preferred set-
ting in most cases.
Units Settings
Distance & Speed lets you select the desired
units of measure for distance and speed
readouts in ‘Nautical’, ‘Statute’ or ‘Metric’
terms.
Heading lets you select the reference used in
calculating heading information. You can
select from ‘Auto Mag Var’, ‘True’, ‘Grid’ and
‘User Mag Var’. ‘Auto Mag Var’ provides
magnetic north heading references which are
automatically determined from your current
position. ‘True’ provides headings based
upon a true north reference. ‘Grid’ provides
headings based on a grid north reference
(and is used in conjunction with the grid
position formats described on page 78). ‘User
Mag Var’ allows you to specify the magnetic
variation at your current position and
provides magnetic north heading references
based upon the variation you enter.
Altitude/Elevation lets you select altitude
readouts in ‘Feet’ or ‘Meters’.
To select a units setting:
1. Highlight the desired field and press ENTER to
display the available options.
2. Select the desired option and press ENTER.
3. If ‘User Mag Var’ is selected in the ‘Heading’ field,
highlight the heading reference field (immediately
to the right) and press ENTER. Enter the magnetic
variation at your current position using the rocker
keypad and press ENTER.
WARNING: If ‘User Mag Var’ is selected, you
must periodically update the magnetic
variation as your position changes. Using this
setting, the GPS 12 MAP will not automati-
cally calculate and update the magnetic
variation at your present position. Failure to
update this setting may result in substantial
differences between the information dis-
played on your GPS 12 MAP and external
references, such as a magnetic compass.