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Main Menu
Setup Tab: Location
Heading— lets you select the reference used in calculating heading information. 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 the
previous page); 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.
To set a user-defi ned magnetic variation:
1. From the ‘Setup’ tab, use the ARROW KEYPAD to select ‘Units’ at the top of the page.
2. Use the ARROW KEYPAD to highlight the “Heading” fi eld and press ENTER.
3. Select ‘User Mag Var’ and press ENTER.
4. Use the ARROW KEYPAD to highlight the ‘Magnetic Variation’ fi eld and press ENTER.
2. Use the ARROW KEYPAD to enter the magnetic variation at your current position 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 unit will not automatically
calculate and update the magnetic variation at your present position. Failure to update
this setting may result in substantial differences between the information displayed on
your unit and external references, such as a magnetic compass.
,
Heading reference options include True North, Auto Magnetic
Variation and User Magnetic Variation. ‘Auto Mag Var’ will
automatically calculate magnetic north for your location.
In areas with high iron deposits or other factors affecting mag-
netic variation, you may wish to select ‘User Mag Var’ and enter
a specifi c variation between true north and local magnetic north.
190-00283-00Backup.indd 95 12/8/2002, 8:09:46 PM