4.3
HSI and EHSI Operation
If an HSI is used to display navigation data from the GTN the pilot should rotate
the course pointer as prompted on the GTN.
If an EHSI is used to display navigation data from the GTN the course pointer
may autoslew to the correct course when using GPS navigation. When using
VLOC navigation the course pointer will not autoslew and must be rotated to the
correct course by the pilot. For detailed information about the functionality of
the EHSI system, refer to the FAA approved Flight Manual or Flight Manual
Supplement for that system.
The pilot must verify the active course and waypoint for each
flight plan leg. The pilot must verify proper course selection
each time the CDI source is changed from GPS to VLOC.
See Section 4.5 for RF leg capabilities related to EHSI.
4.4
Autopilot Operation
The GTN may be coupled to an optional autopilot, if installed in the aircraft,
when operating as prescribed in the LIMITATIONS section of this manual.
Autopilots coupled to the GTN system in an analog (NAV) mode will follow
GPS or VHF navigation guidance as they would with existing VOR receivers.
Autopilots that support GPSS or GPS Roll Steering in addition to the analog
course guidance will lead course changes, fly arcing procedures, procedure
turns, and holding patterns if coupled in a roll steering mode.
The GTN supports autopilot roll steering for heading legs when an approved
heading source is interfaced to the GTN. This heading interface can also provide
map orientation, traffic and StormScope heading data and wind calculations.
The GTN does not provide course deviation to the autopilot
for heading legs. Some autopilots do not allow the use of roll
steering when course deviation is not provided.
This installation has a heading source. The GTN will provide roll steering
on heading legs for the autopilot.
This installation does not have a heading source. The crew cannot use the
GTN roll steering to fly heading legs with the autopilot.
For autopilot operating instructions, refer to the FAA approved Flight Manual or
Flight Manual Supplement for the autopilot.
AFMS, Garmin GTN GPS/SBAS System
FAA APPROVED
CAUTION
CAUTION
190-01007-A2 Rev. 6
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