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5. CUSTOMIZING YOUR UNIT
5-3
Contents of general setup menu (con’t from previous page)
Item Description Settings
Range & Bearing
Mode
Chooses how to calculate range and
bearing.
Rhumb Line: Straight
line drawn between two
points on a nautical
chart.
Great Circle: Shortest
course between two
points on the surface of
the earth.
Bearing Readout Chooses bearing display format for course,
course over ground and cursor bearing.
True, Magnetic
Magnetic Variation
The magnetic variations for all areas of the
earth are preprogrammed into this unit. The
preprogrammed variation is accurate for
most instances, however you may wish to
manually enter a variation. For manual input,
select Manual, hit the EDIT soft key, enter
value, then hit the ENTER soft key to finish.
“AUTO” requires position data.
Auto, Manual
Display Mode
(GD-1700)
Reverses background (black) and
foreground (white) colors.
Day, Night