Furuno FEA-2807 - Dual Gyro Interface for DNV NAUT-AW

19. Navigation Sensors
19-11
19.7 Dual Gyro Interface for DNV NAUT-AW
DNV NAUT-AW requires dual gyro interface for a track control system, which consists of the ECDIS and the
Autopilot FAP-2000. The benefit of this arrangement is that loss of a single gyro does not interrupt track control.
The track control system can continue smoothly with a backup gyro.
Dual gyro interface is accomplished by connecting two gyros (Gyro 1 and Gyro 2) directly to the Autopilot
FAP-2000. A selection switch (first priority Gyro selector) is used to select heading source for Autopilot FAP-2000,
ECDIS and common gyro distribution unit. The ECDIS indicates the state of "First priority Gyro Select selector"
switch on the Speed/Course page of the Sensors dialog box, with the text indication "active" or "backup" in the Gyro
1 or Gyro 2 field.
Smoothing is added for smooth transition (i.e., without unexpected large rudder movements) from one gyro source
to another gyro source. This smoothing is used both for operator-requested changes (i.e., operator change position of
"First priority Gyro Select selector") and for automatic changes (i.e., automatic continuation with backup source).
Gyro 1
Gyro 2
Gyro 2 through Trackpilot
IEC-61162-1 ($XxHDT)
or
Stepper/Synchro
ARPA
ARPA
Select
ARPA
Gyro
Repeater
Radar
Common
Distribution
Unit for Gyro
Gyro 2 Gyro 1
AutoPilot
ECDIS
Gyro 1
Gyro 2
Gyro 1 Gyro 2
First priority
Gyro selector
(Selected gyro
(Gyro 1 or Gyro 2)
POSN
SPD/CRS
Radar
kn
kn
kn
kn
kn
(CALC)
Gyro data distribution for track control system