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While the active route page offers the necessary functions for creating, monitoring
and modifying the active route, the CDI page is used to provide turn anticipation, next
desired track and waypoint arrival information to the pilot. During route navigation,
the GNC 300’s turn anticipation feature will smooth out the transition between
adjacent route legs by providing navigation along a curved path segment.
This leg transition is based on the aircraft’s actual ground speed and the difference
between the course angle of the two legs. The GNC 300 will automatically sequence to
the next leg when you are abeam the ‘active to’ waypoint and on the curved transition
segment (the to/from indicator on the CDI will flip momentarily). During the transi-
tion, the CDI will be referenced to the dotted line illustrated above. Turn anticipation
will not be provided if: (1) waypoint/fix crossing is a requirement of the approach; (2)
The GPS SEQ switch is set to HOLD; or (3) your current ground speed and the course
angle between the two legs would require a bank angle greater than 25º.
To use the turn anticipation feature, note the ‘Nxt dtk’ heading when the external
waypoint annunciator begins to flash, and start the turn when the annunciator glows
steadily (approx. 2 seconds before the turn anticipation point). Once you’ve reached
the turn anticipation point, the ‘dtk’ field on the CDI page will change to display the
course value for the next leg. If you have not adjusted your OBS/HSI before the turn,
the ‘Nxt dtk’ will continue to flash until you have reached the midpoint of the turn.
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DIRECT-TO &
ROUTE NAV
Turn Anticipation
The desired track for the next leg will appear in
the CDI field 15 seconds before the turn anticipa-
tion point.
The waypoint annunciator will glow steadily 2
seconds before the turn anticipation point.
GPS APPR
GPS WPT
Turn Anticipation
SECTION
5
ROUTES
Turn Anticipation
300 7/14/98 8:50 AM Page 71