CHAPTER 4 REFERENCE GUIDE
Page 4-56
091-00019-001 REV B
EFD1000 C3 Pro PFD Pilot’s Guide
Figure 4-110
GPSS Enabled with Autopilot in
HDG Mode
Figure 4-111
GPSS Disabled and Autopilot in
HDG Mode
When GPSS is enabled, and the autopilot is in HDG mode, the autopilot will follow the
steering commands from the GPS. A GPSS enabled state will be indicated on the PFD
in two locations: 1) the GPSS legend adjacent to the GPSS Hot Key will be shown in
inverse green; and 2) the annunciation GPSS1 (or GPSS2, depending on the selected
source), along with an inverse A, will be shown next to the HDG reference at the top of
the Navigation Display, to the right of the Magnetic heading indication (Figure 4-110).
When GPSS is disabled, and the autopilot is in HDG mode, the autopilot will follow the
PFD Heading Bug. A GPSS disabled state will be indicated on the PFD in two locations:
1) the GPSS legend adjacent to the GPSS Hot Key will be shown in gray; and 2) the
Selected Heading Field will return. (Figure 4-111).
When the PFD Basemap navigation source is GPS1, enabling GPSS with the autopilot
in HDG mode will cause the autopilot to track the ight plan in GPS1, and GPSS1 will
be annunciated by the HDG reference at the top of the Navigation Display. Similarly,
when GPS2 is the Basemap navigation source on the PFD, and GPSS is enabled, the
autopilot in HDG mode will track the GPS2 ight plan, and GPSS2 will be annunciated
at the top of the navigation display. See Section 4.4.5. for additional information on the
relationship among the CDI Navigation Source, Basemap Navigation Sources, and GPSS
Navigation Source.
When using GPSS with a stand-alone VLOC receiver, or with a combined GPS/VLOC
navigator (e.g. the GNS-430/530), GPSS will continue to follow the GPS output of that
combined navigator, even when VLOC is selected as the PFD Selected CDI Navigation
Source. With combined GPS/VLOC receivers, the transition from GPS to VLOC may occur
automatically, depending on how that system has been congured by the pilot.
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