Garmin GNS 430 - Manual (Page 258)

GNS 430(A) Pilot’s Guide and Reference 190-00140-00 Rev. P
APPENDIX C
TROUBLESHOOTING
C-4
When should I use the OBS key to return to
auto sequencing, and what happens when I do?
The most common application for using the OBS Key
is the missed approach. The GNS 430 suspends automatic
waypoint sequencing (indicated by a ‘SUSP’ annunciation
directly above the OBS Key; see Figure C-4) when the
aircraft crosses the missed approach point (MAP). This
prevents the GNS 430 from automatically sequencing
to the missed approach holding point (MAHP). If a
missed approach is required, press the OBS Key to return
to automatic waypoint sequencing and sequence the
approach to the MAHP. See Section 6.2, Flying the Missed
Approach for more information on missed approaches.
Figure C-4 ‘SUSP’ Annunciation
Why won’t my unit automatically sequence to
the next waypoint?
The GNS 430 only sequences flight plan waypoints
when automatic sequencing is enabled (i.e., no ‘OBS’ or
‘SUSP’ annunciation directly above the OBS Key). For
automatic sequencing to occur, the aircraft must also cross
the bisector of the turn being navigated. The bisector is
a perpendicular line between two flight plan legs which
crosses through the waypoint common to both legs.
How do I skip a waypoint in an approach,
departure or arrival?
The GNS 430 allows the pilot to manually select any
approach, departure, or arrival leg as the active leg of the
flight plan. This procedure is performed from the Active
Flight Plan Page by highlighting the desired waypoint and
pressing the Direct-to Key twice, then press the ENT
Key to approve the selection (Figure C-5). The GPS then
provides navigation along the selected flight plan leg, so
be sure to have clearance to that position. See Section 5.2,
Shortcuts for more information.
Figure C-5 Activate Leg Window
How do I fly the GPS with an autopilot and DG
heading bug?
If the installation does not have an HSI, the pilot
should make the course selections on the external CDI’s
OBS knob and the DG heading bug.