Chapter 11 - Customizing the Unit
951/952 Operator’s Manual Rev. B
Page 153
NOTE:
If your unit is equipped with an internal differential receiver, differential
GPS corrections (DGPS—if available) will always be used when either
GPS or Phantom Loran is selected as the navigation source.
Use the
NAVIGATION SOURCE
option to select which source
to use. To change the option, press the
menu key, and
use the
to view the choices. Press the
key to make your selection, or
to leave the option
unchanged.
Choosing magnetic
variation
Compasses naturally point to the
magnetic
north pole, which is
several hundred miles from the Earth’s
geographic
north pole.
The difference between the angles to the two poles is known
as
magnetic variation
. The unit offers you the option of choos-
ing from:
•
True
(0º)
•
Automatic
(the unit calculates variation automatically,
according to your location)
•
Manual
(from 0º to 180º, East or West)
The factory default setting is “automatic,” to coincide with
your compass. Your navigation charts indicate the approxi-
mate magnetic variation for each area.
Under most conditions, you’ll want the unit to calculate the
variation
automatically
for your position. Usually, the automat-
ically-calculated variation is entirely adequate for use.
True
bearings are usually required when using a gyrocompass.
The
manual
setting (1º to 180º) is available for those times
when the display must match an older or less accurate chart,
or in remote areas (such as above 70º north latitude) where
the unit’s variation calculations can be off by a significant
amount.
To change this option, press the
key, then use the
to view the choices. If choosing
MANUAL
, move the
cursor to the right to enter the variations for your area. Press
the
key to make your selection, or
to leave the
option unchanged.
Summary of Contents for 951
Page 6: ...Page iv 951 952 Operator s Manual Rev B ...
Page 8: ...Page vi 951 952 Operator s Manual Rev B ...
Page 10: ...Page viii 951 952 Operator s Manual Rev B ...
Page 24: ...Page 14 951 952 Operator s Manual Rev B Chapter 1 Quick Start ...
Page 40: ...Page 30 951 952 Operator s Manual Rev B Chapter 2 Introducing the Northstar 951 952 ...
Page 50: ...Page 40 951 952 Operator s Manual Rev B Chapter 3 Using the Controls ...
Page 124: ...Page 114 951 952 Operator s Manual Rev B Chapter 7 Creating Routes ...
Page 136: ...Page 126 951 952 Operator s Manual Rev B Chapter 8 Understanding Waypoint Route Navigation ...
Page 154: ...Page 144 951 952 Operator s Manual Rev B Chapter 10 Using Other Special Functions ...
Page 184: ...Page 174 951 952 Operator s Manual Rev B Chapter 11 Customizing the Unit ...
Page 188: ...Page 178 951 952 Operator s Manual Rev B ...
