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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