Furuno GP-3700F Operator's Manual page 118

9. OTHER FUNCTIONS
[PITCH OFFSET]: Sets the offset value for pitch.
[ROLL OFFSET]: Sets the offset value for roll.
[LAT./LON. GRID]: Selects the display format for latitude and longitude from
[DD°MM.MM'], [DD°MM.MMM'], [DD°MM.MMMM'], or [DD°MM'SS.S''].
[RANGE/SPEED]: Selects the unit for range and speed from [NM, kn], [km, km/h] or
[SM, mph].
[WIND SPEED]: Selects the unit for wind speed from [kn], [m/s] or [mph].
[DEPTH]: Selects the unit for depth from [m], [ft], [fm] or [HIRO].
[HIRO SETTING]: Sets the value for 1 HIRO by meter.
[WATER TEMPERATURE]: Selects the unit for water temperature from [°C] or [°F].
[TIME]: Selects the format for time display from [12 HOURS] or [24 HOURS].
[BEARING MODE]: Selects how to calculate course and bearing, [TRUE DIRECTION]
or [MAGNETIC DIR.]. True bearing is a bearing measured using true North as the ref-
erence direction, and it is calculated by the formula True Bearing = Magnetic Bearing
+ Magnetic Variation. Magnetic bearings are measured with magnetic north as the ref-
erence direction. Select [MAGNETIC DIR.] when using a magnetic compass, [TRUE
DIRECTION] for using the gyrocompass.
[MAGNETIC BRG OFFSET]: Selects the method how to correct magnetic bearing, au-
tomatically or manually.
[MANUAL MAG. VAR.]: Sets the offset value for magnetic bearing when selecting
[MANUAL] in [MAGNETIC BRG OFFSET]. The location of the magnetic north pole is
different from the geographical north pole. This causes a difference between the true
and magnetic north location. This difference is called magnetic variation, and varies
with respect to the observation point on earth. Your unit is preprogrammed with all the
earth's magnetic variations. However, you may wish to enter variation manually to re-
fine accuracy.
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