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AUTOMATIC FLIGHT CONTROL SYSTEM
NAVIGATION MODES (GPS, VOR, LOC, bC)
The selected navigation receiver must have a valid VOR or LOC signal or active GPS course for the
NOTE:
flight director to enter Navigation Mode.
When intercepting a flight plan leg, the flight director gives commands to capture the active leg at
NOTE:
approximately a 45° angle to the track between the waypoints defining the active leg. The flight director
does not give commands fly to the starting waypoint of the active leg.
When making a backcourse approach, set the Selected Course to the localizer front course.
NOTE:
Pressing the NAV Key selects Navigation Mode. Navigation Mode acquires and tracks the selected navigation
source (GPS, VOR, LOC). The flight director follows GPS roll steering commands when GPS is the selected
navigation source. When the navigation source is VOR or LOC, the flight director creates roll steering commands
from the Selected Course and deviation. Navigation Mode can also be used to fly non-precision GPS and LOC
approaches where glideslope capture is not required.
Backcourse Navigation Mode is selected when the localizer front course is greater than 105° from the aircraft
heading. Backcourse Navigation Mode captures and tracks a localizer signal in the backcourse direction. The
annunciation 'BC' in the AFCS Status Box indicates Backcourse Navigation Mode.
If the Course Deviation Indicator (CDI) shows greater than one dot when the NAV Key is pressed, the selected
mode is armed. If the CDI is less than one dot, Navigation Mode is automatically captured when the NAV Key
is pressed. The armed annunciation appears in white to the left of the active roll mode.
When the CDI has automatically switched from GPS to LOC during a LOC/ILS approach, GPS Navigation
Mode remains active, providing GPS steering guidance until the localizer signal is captured. LOC Navigation
Mode is armed automatically when the navigation source switch takes place if the APR Key is not pressed prior
to the automatic source switch.
If Navigation Mode is active and either of the following occur, the flight director reverts to Roll Hold Mode
(wings rolled level):
• Different VOR tuned while in VOR Navigation Mode (VOR Navigation Mode reverts to armed)
• Navigation source manually switched (with the CDI Softkey)
• During a LOC/ILS approach the FAF is crossed while in GPS Navigation Mode after the automatic navigation
source switch from GPS to LOC
382
Figure 7-22 GPS Navigation Mode Armed
Garmin G1000 Pilot's Guide for Diamond DA40/40F
190-00592-06 Rev. A
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