Garmin G3X Pilot’s Guide
190-01115-00 Rev. K
338
AFCS
System
Overview
Flight
Instruments
EIS
CNS
Interface
GPS
Navigation
Flight
Planning
Hazar
d
Avoidance
Additional
Featur
es
AFCS
Annun/Alerts
Appendix
Index
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 when the automatic
navigation source switch takes place. If the
APR
Key or
AP NAV
Softkey is pressed
prior to the automatic navigation source switch, LOC Navigation Mode is armed.
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
SRC
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
C
hanging
the
S
eleCteD
C
ourSe
The Selected Course is controlled by pressing the
OBS CRS
Softkey,
VOR
CRS
Softkey, or
LOC CRS
Softkey, (while in OBS, VOR, LOC, or BC Mode)
and turning the
FMS
Joystick on the G3X PFD (or PFD Page) to select the
desired course (or press
XPDR/CRS
>
OBS CRS
/
VOR CRS
/
LOC CRS
from the PFD (or PFD Page) if a transponder is configured).
LOC Mode is activated when the automatic navigation source switch takes
place. If the
APR
Key or
AP APPR
Softkey is pressed prior to the automatic
navigation source switch, LOC Mode is armed.
In the right circumstances, LOC and GS Modes can be armed while GPS
Mode is still active and the external navigator is set to GPS (not VLOC).
Arming LOC & GS Modes while GPS Mode is still active:
1)
EXTERNAL NAVIGATOR: Tune and activate the desired localizer frequency.
2)
EXTERNAL NAVIGATOR: Load the approach (LOC, ILS, LDA, SDF, etc) into
the flight plan.
3)
G3X: While GPS is still the selected navigation source on the external
navigator, press the
APR
Key (GMC 305) or
AP APPR
Softkey to arm LOC
and GS (Glideslope) Modes even with GPS Mode still active. The external
navigator will switch from GPS to VLOC automatically and the G3X will
capture the localizer and then the glideslope.
Summary of Contents for G3X Touch
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