Garmin G1000 NXi Pilot's Manual page 366

AUTOMATIC FLIGHT CONTROL SYSTEM
NAVIGATION MODES (GPS, VOR, LOC)
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 to 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 GPS and LOC
approaches where vertical guidance is not required.
Backcourse Mode captures and tracks a localizer signal in the backcourse direction. The mode may be
selected by pressing the BC Key. Backcourse Mode is armed if the CDI is greater than one dot when the mode
is selected. If the CDI is less than one dot, the Backcourse Mode is automatically captured when the BC Key
is pressed. The flight director creates roll steering commands from the Selected Course and deviation when
in Backcourse Mode
If the Course Deviation Indicator (CDI) shows greater than one dot when the NAV or BC Key is pressed,
the selected mode is armed. If the CDI shows less than one dot, Navigation Mode is automatically captured
when the NAV or BC Key is pressed. The armed annunciation appears in white to the left of the active lateral
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
352
Figure 7-12 GPS Navigation Mode Armed
Garmin G1000 NXi Pilot's Guide for the Cessna Nav III
190-02177-00 Rev. A