5 of 22
01/08/2020
Definition of Terms
AP56 Display:
The Operation unit, with LCD Display
and pushbuttons.
C-Drive Assembly:
The Electric Steering control
amplifier; this houses the main
processor and steering circuitry.
Rudder Feedback Unit (RFU):
This provides the required rudder
position information for steering
control.
• Rudder Feedback Unit Standard
(RFUS)
• Rudder Feedback Unit Heavy Duty
(RFUH)
Remotes:
This is a collective term for a control
device which are normally mounted
in a position remote from the main
control display. Each of these
function in similar ways, but differ in
appearance.
Remotes include:
•
Electric helm
• Steering lever (FFU)
• Jog lever (NFU)
• Hand remote
• Active remote
Rudder Angle Indicator (RAI):
Displays the current rudder position.
Heading:
The magnetic heading of the vessel
at the current time.
Course-to-steer:
The magnetic heading which the
autopilot is attempting to achieve.
Waypoint Steering.
When interfaced to a GPS the
autopilot is able to steering along a
route pre programmed into the GPS.
NMEA Heading
The autopilot is able in accept
heading data from an external source
(eg: GPS compass or E-Compass) in
NMEA 0183 format
