Matsutec HP-33A, Руководство оператора

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8
. OTHER FUNCTIONS
This chapter describes menu items not carried in other chapters.
8
.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.
8-1