Garmin GNS 430 Pilot's Manual And Reference page 228

APPENDIX D
TROUBLESHOOTING
Why does my CDI not respond like a VOR when
OBS mode is active?
Unlike a VOR, the CDI scale used on GPS equipment
is based on the cross-track distance to the desired course,
not an angular relationship to the destination (Figure
D-8). Therefore, the CDI deflection on the GPS is
constant regardless of the distance to the destination, and
does not become less sensitive when further away from
the destination. For more information on the CDI scale,
see Section 10.4.
CDI Comparison: GPS vs. VOR
Figure D-8 CDI Comparison
What is the correct missed approach
procedure? How do I select the missed
approach holding point?
To comply with TSO specifications, the GNS 430 does not
automatically sequence past the MAP. The active-to waypoint
sequences to the first waypoint in the missed approach
procedure when the OBS Key is pressed after crossing the
MAP. All published missed approach procedures must be
followed, as indicated on the approach plate.
To execute the missed approach procedure prior to the
MAP (not recommended), select the Active Flight Plan
Page, highlight the MAHP, press the Direct-to Key, and
then press the ENT Key twice.
D-6
2 2
nm nm
5 nm 5 nm 5 nm 5 nm
GNS 430 Pilot's Guide and Reference
How do I re-select the same approach or
activate a new approach after a missed
approach?
After flying all missed approach procedures, the pilot
may reactivate the same approach for another attempt from
the Procedures Page. Once given clearance for another
attempt, activate the approach from the Procedures Page
by highlighting 'Activate Approach?' and then pressing the
ENT Key. The GNS 430 provides navigation along the
desired course to the waypoint and rejoin the approach
in sequence from that point on. See Section 5.2, Active
Flight Plan Options for information on activating a specific
flight plan leg.
To activate a new approach for the same airport, select
the new procedure from the Procedures Page. To view
the Procedures Page, press the PROC Key and turn the
large right knob to highlight 'Select Approach?'. Press
the ENT Key and turn the large right knob to highlight
the new desired approach. Press the ENT Key to select
the approach, then select the desired transition. Finally,
highlight 'Activate?' at the bottom right corner of the screen
and press the ENT Key to activate the new approach.
To activate a new approach to a different airport, press
the Direct-to Key and select the desired airport using
the small and large right knobs. Press the ENT Key to
accept the selected airport, then follow the steps in the
preceding paragraph to select an approach for the new
airport. See Section 6.1 for more information on selecting
and activating approaches.