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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

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

190-01007-A2 Rev. 6

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