Garmin GPS 400 Pilot's Manual And Reference page 164

TROUBLE-
APPENDIX D
SHOOTING
Whenever OBS mode is active, the GPS 400 allows you to select the desired course to/from a waypoint using the HSI (much like a VOR)
and display a to/from flag for the active-to waypoint. If an external course input is not available, you may select the OBS course on-screen, via
a "Select OBS Course pop-up window. With OBS mode cancelled, the CDI will always display a 'TO' indication for the next waypoint once
you've crossed the active waypoint (provided the active waypoint is not the last waypoint). Refer to page 62 for an example using the
O
One application for the
along the waypoint side of the hold. For many approach operations, setting and resetting of waypoint sequencing is automatic. Holding pat-
terns that are part of an approach will automatically disable waypoint sequencing, then re-enable waypoint sequencing after one time around
the holding pattern. A "SUSP" annunciation will appear directly above the
tion left) to indicate that automatic waypoint sequencing is temporarily suspended and course
selection is not available. If more than one trip around the holding pattern is desired, press the
O
key to again suspend waypoint sequencing. An example of this operation is an approach
which begins with a holding pattern at the initial approach fix (IAF). See page 63 for more infor-
mation on the "SUSP" annunciation and approaches with holding patterns.
What does the O
O
The key is used to select manual (OBS mode) or automatic waypoint sequencing of
waypoints. Activating OBS mode (as indicated by an
O
key) holds your current 'active to' waypoint as your navigation reference and prevents the
GPS from sequencing to the next waypoint. When OBS mode is cancelled, automatic waypoint
sequencing is selected, and the GPS 400 will automatically select the next waypoint in the flight
plan once the aircraft has crossed the present active-to waypoint.
NORMAL (no "OBS" annunciator)
Automatic sequencing of waypoints
Change in HSI does not affect CDI deflection
Always navigates 'TO' the active waypoint
Must be in this mode for final approach course
O
key is holding patterns. The
key do and when do I use it?
Manual sequencing- 'holds' on selected waypoint
Manually select course to next waypoint from HSI
Will indicate 'TO' or 'FROM' waypoint
Cannot be set for final approach course or published holding patterns
key is used to suspend waypoint sequencing and select the desired course
O
key (see illustra-
annunciation directly above the
OBS
O
key.