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The GPS SEQ switch is used to select manual or automatic waypoint sequencing
of waypoints. Setting the GPS SEQ switch to the HOLD position holds your current
‘active to’ waypoint as your navigation reference and prevents the GPS from sequenc-
ing to the next waypoint. When the GPS SEQ switch is set to the AUTO position,
automatic waypoint sequencing is selected. Whenever the GPS SEQ switch is
engaged, the HOLD annunciator will illuminate and the GPS will continue navigating
to the active-to waypoint regardless of your position relative to other waypoints.
The GPS SEQ switch must be set to the HOLD position any time you are deviat-
ing from the flight sequence of an approach (e.g., when you are flying radar vectors)
or when you must cross the same waypoint twice in succession (e.g., procedure turn,
IAF and FAF at the same waypoint). Whenever the GPS SEQ switch is set to the
HOLD position, the GNC 300 allows you to select the desired course to/from a way-
point using the HSI, much like a VOR.
Whenever the GPS SEQ switch is released from the HOLD position, the GNC 300
will ‘capture’ the present HSI setting as your desired course. Always dial in your next
desired course before returning the GPS SEQ switch to the AUTO position. The GPS
SEQ switch may be released from the HOLD position 2 seconds after the inbound
course has been set. The GNC 300 will continue navigation on the last selected
course
through the active-to waypoint and sequence to the next approach waypoint.
74
APPROACH NAVI-
GATION
GPS SEQ Switch
Always set the desired course on the OBS/HSI
BEFORE returning the GPS SEQ switch to the
‘AUTO’ position.
SECTION
6
APPROACH NAV
GPS SEQ Switch
GPS SEQ
AUTO ACTV
GPS SEQ
AUTO HOLD
OBS
TO
FR
N
33
30
W
24
21
S
15
12
E
6
3
GPS SEQ
AUTO ACTV
300 7/14/98 8:50 AM Page 74