CHAPTER 4, REFERENCE GUIDE
EFD1000 PFD Pilot’s Guide
Page 4-46 A-01-184-00 REV B
EFD1000 PFD Pilot’s Guide
EFD1000 PFD Pilot’s Guide
4.6.1. GPS Steering (GPSS)
GPS Steering represents a modernized approach to ying between ight plan
waypoints, and oers many advantages of over traditional methods of ying direct
course lines between waypoints.
With traditional point-to-point navigation, the autopilot is provided with desired course
and cross-tack deviation information associated with the current ight leg. From there,
it will maneuver the aircraft to center the needle and track the desired course. The
autopilot does not anticipate upcoming course changes, nor can it y curved ight
paths without pilot assistance, and it has to recompute wind corrections following each
course change. Upon reaching a waypoint, the pilot must set the course for the next
leg (unless Auto Course Select is enabled, see Section 4.3.6), and the autopilot will
then intercept and track that leg. In this type of operation, the CDI must always be set
to the current desired navigation course.
With GPS Steering, the EFD1000 can unlock the GPS Steering capability already available
in many models of General Aviation GPS computers. In GPS systems with this capability,
the GPS continually computes the desired bank angle to track the GPS ight plan, and
outputs that information over an ARINC 429 data bus. The GPS Steering command
includes anticipation of upcoming turns; this includes the turn rate and turn initiation
point required to roll out centered on the next leg, with the deviation needle centered.
Some GPS systems, such as the Garmin 4xx/5xxW series of WAAS navigators, even
provide GPS Steering commands for complex procedures, such as DME arcs, holding
patterns, procedure turns, etc., allowing the autopilot to y these maneuvers without
pilot input. Check with your GPS manufacturer to see if your GPS supports these
capabilities.
The EFD1000 translates GPS Steering commands received over an ARINC 429 bus into a
signal that is compatible with the autopilot Heading channel. Thus, by selecting GPSS
NOTE
When GPSS is selected on the
EFD1000, the autopilot must be in
Heading mode to follow the GPSS
command. The GPSS feature requires
installation of the optional ACU.
NOTE
Refer to the Aircraft Flight Manual
Supplement for your GPS system for
information about GPSS steering
commands that may be output by
that system.
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