Other Functions; Plotter Setup Menu - Furuno GP-33 User Manual

7.

OTHER FUNCTIONS

This chapter describes menu items not carried in other chapters.
7.1

Plotter Setup Menu

COG Line
You can show or hide the COG line on the plotter display.
COG/BRG ref.
Boat's course and bearing to a waypoint are displayed in true or magnetic bearing.
Magnetic bearing is true bearing plus (or minus) earth's magnetic variation. Select the
bearing reference in according to the compass installed: magnetic for magnetic com-
pass, true for gyrocompass or satellite compass using true bearing.
Magnetic Variation
The location of the magnetic north pole is different from the geographical north pole.
This causes a difference between the true and magnetic north direction. The differ-
ence is called magnetic variation, and varies with respect to the observation point on
earth. Your unit is pre-programmed with all the earth's magnetic variation. However,
you may wish to enter variation manually to refine accuracy using the latest chart. Set
[COG/BRG ref.] on the Plotter Setup menu to [Mag] to use magnetic variation.
To enter magnetic variation manually, do the following:
1) If necessary, change coordinate from east to west or vice versa.
2) Enter the value referring to a recent nautical chart.
3) Press the ENT key.
7-1