Raymarine GPS navigation User Manual
Page 61
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TYPE
I
I
NAV SETUPS MENU
MANUAL VARIATION
POSITION
l
PRESS CLEAR
AVERAGING
TO
3.10.4 NAV Setups Menu- Loran
NAV Setups for Loran include making choices of bearing types, position
corrections, and averaging constants for smooth (but responsive) readouts.
Modes
As with most navaids, Course and Bearing readouts can appear referenced
to True North or Magnetic North on the screen. When the
COURSE/BEARINGS
is pressed the
menu permits selection of True
or Magnetic readouts. On the menu:
Press
for True Bearings.
Press
for Automatic Magnetic Bearings
Press
MANUAL VARIATION
for manual Magnetic bearings
True North mode
When the unit is shipped from the factory the readouts for Course and
Bearing are displayed in “Magnetic North”. To display “True North” data’ it
is necessary to de-activate the “AUTO” Magneticvariation mode. Press the
The Course and Bearing readouts will now be in degrees “True”.
The
indicators, on the screen, will become
Magnetic North Mode
are pressed, the unit will
produce magnetic courses and bearings. The primary difference between these two
modes is that the variation values often
from area to area. The
automatic variation program selected
can adjust for
these changes. The Manual variation mode uses a fixed value that is usually
accurate for a specific area.
Manual Magnetic Variation
In rare cases the Auto Mag Variation may be off by a degree in certain
locations. In this case, you could turn
OFF
the Auto magnetic
OPERATION 3-48