NorthStar 957 Operator's Manual page 151

Choosing magnetic
variation
Switching
waypoints manually
or automatically
957 Operator's Manual, Rev. B
This option also includes a setting for demo mode. For instructions on
demo mode, see "Using demo mode" starting on page 14.
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 957 provides the option of choosing
from:
•
true - 0º
•
automatic - the 957 calculates variation automatically
according to your location
•
manual - from 0º to 180º, East or West
True bearings are usually required when using a gyrocompass.
The factory default setting is automatic, to coincide with a
magnetic compass. Your navigation charts indicate the
approximate magnetic variation for each area. Under most
conditions, you'll want the 957 to calculate the variation
automatically for your position, since the automatically
calculated variation usually is entirely adequate.
The manual setting (1º to 180º) is available when the display
must match an older or less accurate chart, or in remote areas
(such as above 70º north latitude) where the 957's variation
calculations can be significantly off.
You can set the 957's waypoint switching to:
•
automatic - the 957 automatically switches to the next
waypoint upon arrival at each waypoint
•
manual - you manually switch to the next waypoint
When set to automatic, the 957 displays the new distance and
bearing information for the next waypoint when you arrive at
the previous one. It immediately stops navigating when you
pass a lone waypoint or the last waypoint in a route.
For instructions on changing the waypoint arrival distance, see "Arrive
radius" starting on page 128.
Chapter 11 - Setting up your 957
NOTE:
NOTE:
Page 143