Garmin G600 Pilots Guide - Page 207
Autopilot Operation with the GDU 620 Emulating GPSS
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Foreword Sec 1 System Sec 2 PFD Sec 3 MFD 5.6.3.2 Autopilot Operation with the GDU 620 Emulating GPSS NOTE: The GDU 620 has the ability to emulate GPSS roll steering for autopilots that do not support GPSS. The GDU 620 emulates GPSS by sending headings to the autopilot that guide turn anticipation. Many autopilots do not have a GPSS mode. GPSS utilizes roll command signals calculated by the GPS navigator and sent to the autopilot in order to allow the aircraft to anticipate turns, make smooth transitions when passing waypoints, and fly leg types, such as Procedure Turns and Course Reversals. In order for GPSS to function correctly, the autopilot must have the capability of interpreting the roll commands. In order to provide GPSS functionality for autopilots that do not support roll commands, the GDU 620 has the capability to emulate GPSS commands by continually changing the selected heading data sent to the autopilot. GPSS emulation functionality in the GDU 620 is controlled by an optional external Autopilot Heading Datum switch. When GPSS emulation is active on the GDU 620, the HSI heading bug does not control the autopilot. Instead, the GDU 620 processes heading information and sends it to the autopilot to emulate what GPSS would normally do. The GPSS/Heading bug inactive annunciation in the lower left corner of the PFD reminds the pilot that the heading bug is not controlling the autopilot. 1) Select GPS navigation on the HSI. 2) Set the HSI to the desired course (if in OBS mode). 3) Set the optionally installed Autopilot Heading Datum switch to GPSS. Heading Bug Inactive Indication Sec 4 Hazard Avoidance Features Sec 5 Additional Sec 6 Annun. & Alerts Sec 7 Symbols Sec 8 Glossary Appendix A Appendix B Index Figure 5-22 GPSS Emulation Indication 4) Engage your autopilot in Heading mode. 190-00601-02 Rev. B Garmin G600 Pilot's Guide 5-27