Garmin GNC 420W Pilots Guide - Page 248

How do I skip a waypoint in an approach

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APPENDIX C TROUBLESHOOTING 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 GNC 420 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 GNC 420 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. How do I skip a waypoint in an approach, departure, or arrival? The GNC 420 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 Figure C-4 'SUSP' Annunciation Why won't my unit automatically sequence to the next waypoint? The GNC 420 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 fly the GPS with an autopilot and heading indicator 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 heading indicator heading bug. C-4 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K

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GNC 420(A) Pilot’s Guide and Reference
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 GNC 420 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 GNC 420 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 GNC 420 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 GNC 420 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
heading indicator 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 heading indicator heading bug.
190-00140-20
Rev. K