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Whenever you perform a direct-to, the GNC 300 will set a point-to-point great
circle course to your destination. You can also manually define the magnetic course to
your destination with the GNC 300’s Course Select feature. The course select feature
is available on the bottom line of the direct-to confirmation page whenever the
external GPS SEQ switch is in the ‘AUTO’ position.
To manually set a course:
1. Set/confirm that the external GPS SEQ switch is in the ‘AUTO’ position.
2. With the flashing cursor over the desired destination waypoint, press the
D
key. The
direct-to confirmation page will appear.
3. Rotate
O
to place the flashing cursor on the course select field.
4. Use
K
to begin entry of the selected course (the
O
and
K
knobs may be used once
you have started editing the course select field).
5. Press
E
to accept the course, and
E
again to acknowledge the ‘ok?’ prompt.
The GNC 300 will now use the selected course for your CDI and DTK steering
guidance. To reset the course to a GPS-calculated direct course from your present
position, simply press
D
, followed by
E
.
60
APPENDIX A
CDI Scale Settings
The waypoint sequencing indicator, located at the
bottom left of the direct-to confirmation page, dis-
plays the current status of the external GPS SEQ
switch.
To manually set your course from the course select
field, set the GPS SEQ switch to the ‘AUTO’ posi-
tion and enter the selected course in the course
select field. NOTE: Whenever the GPS SEQ switch
is set to the ‘HOLD’ position, the selected course
will be determined by the external OBS/HSI.
NOTE: Whenever you have used the course select
feature on the direct-to confirmation page or the
GPS SEQ switch is set to the ‘HOLD’ position and
external course input is not present, you may also
enter the desired course from the CDI page using
the course field at the bottom left of the page.
Waypoint
Sequencing Status
Waypoint Identifier Field
Waypoint Position, Facility
Name or City/Region
(selectable)
Course Select
Field
SECTION
5
DIRECT-TO
Manually Selecting
A Course
300 7/14/98 8:50 AM Page 60