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4.3

HSI and EHSI Operation

If an HSI is used to display navigation data from the GNS the pilot should rotate

the course pointer as prompted on the GNS.

If an EHSI is used to display navigation data from the GNS 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.

4.4

The GNS 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 GNS 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 GPSS mode.

For autopilot operating instructions, refer to the FAA approved Flight Manual or

Flight Manual Supplement for the autopilot.

190-00356-03 Rev. D

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CAUTION

AFMS, Garmin GNS 4XXW GPS/SBAS System

FAA APPROVED