Garmin G1000 Pilot’s Guide for the Socata TBM 850
190-00709-00 Rev. A
7-26
AUTOMATIC FLIGHT CONTROL SYSTEM
NAVIGATION MODE (GPS, VOR, LOC)
NOTE:
The selected navigation receiver must have a valid VOR or LOC signal or active GPS course for the
flight director to enter Navigation Mode.
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 vertical guidance is not required.
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 lateral mode.
Figure 7-27 GPS Navigation Mode Armed
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
