Raytheon NautoPilot NP 5100 Operator's Manual page 94

Note: Use of the magnetic compass during Track Control is not permitted,
Notes on the heading source selection:
Gyro/GPS
If only one Gyro Compass is connected, this compass acts as the active heading
source.
If several Gyro Compasses are connected within a navigation system, the compass with
the better performance or with an ascertained sequence is selected for the task.
The performance or sequence is ascertained via an external system for navigation data
evaluation and distribution.
GPS Compasses are handled like Gyro Compasses.
The selected GPS Compass is displayed:
Gyro: GPS 2
(if there are more than one GPS Compass)
Magnet
If only one magnetic compass is connected, this compass acts as the active heading
source.
If several magnetic compasses are connected within a navigation system, the compass
with the better performance or with an ascertained sequence is selected for the task.
The performance or sequence is ascertained via an external system for navigation data
evaluation and distribution.
System
If this check box is activated, a compass is selected according to the conditions for the
selection of a Gyro Compass and a magnetic compass.
The sequence of selection is: Gyro/GPS Compasses first, then magnetic compass.
The sequence is Gyro Compasses first, GPS Compasses second and magnetic com-
passes third.
4002.DOC010102
NautoPilot 5000 Series
Track Control mode is aborted at once after selection of a magnetic compass.
It is not possible to select Track Control mode while magnetic heading is used.
OPERATION
82
Edition: September 2014