NorthStar 958 Operator's Manual page 177

Choosing magnetic
variation
Switching
waypoints manually
or automatically
958 Operator's Manual, Rev. A
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 958 provides the option of choosing
from:
•
true—0º
•
automatic—the 958 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 958 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 958's variation
calculations can be significantly off.
You can set the 958's waypoint switching to:
•
automatic - the 958 automatically switches to the next
waypoint upon arrival at each waypoint
•
manual - you manually switch to the next waypoint
When set to automatic, the 958 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 154.
Chapter 12 - Setting Up Your 958
NOTE:
NOTE:
Page 169