CHAPTER 4 REFERENCE GUIDE
EFD1000 PRO MAX PFD Pilot’s Guide
Page 4-59
091-00005-002 ()
course change. Upon reaching a waypoint, the pilot must set the course for the next
leg (unless AUTOCRS is enabled,), and the autopilot will then intercept and track that
leg. In this type of operation, the CDI must always be set to the desired course.
With GPSS, the PFD can unlock the GPS Steering capability already available in many
models of general aviation GPS navigators. With GPSS, the navigator continuously
computes the desired bank angle to track the GPS flight plan, and outputs that
information over a digital data bus. The GPS Steering command anticipates upcoming
turns; this includes the turn rate and turn initiation point required to roll out centered
on the next leg.
Some GPS navigators, even provide GPS Steering commands for complex procedures,
such as DME arcs, holding patterns, and procedure turns allowing the autopilot to fly
these maneuvers without pilot intervention. Check with your GPS manufacturer to see
if your GPS supports these capabilities.
The PFD translates GPS Steering commands received over a digital data bus into a
signal that is compatible with the autopilot Heading channel. Thus, by selecting GPSS
on the PFD and the Heading mode of the autopilot, the autopilot is able to fly
GPSS commands.
WARNING
GPS Steering is a powerful automation tool that
can substantially reduce pilot workload. However,
using GPSS safely and effectively requires a thorough
understanding of your specific aircraft installation and
the interaction between the PFD, your GPS navigator,
and your autopilot. Pilot actions required to use GPSS
safely can vary significantly depending on the autopilot
and GPS navigator installed, especially when used on
instrument approaches, especially those with
vertical guidance.
It is imperative that pilots new to GPSS gain
experience with it in VFR conditions and, ideally,
get dual instruction from a CFII who thoroughly
understands GPSS and the autopilot and GPS
navigator in your airplane before using GPSS on
instrument procedures in IMC.
NOTE
When GPSS is disabled, the autopilot will follow the
Heading Bug.
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