Furuno FEA-2107-BB - Dual Gyro Interface for DNV NAUT-AW

19. Navigation Sensors
19-12
19.6 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 a
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 choose heading source for Autopilot FAP-2000,
ECDIS and common gyro distribution unit. The ECDIS indicates the state of "First priority Gyro Choose 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 Choose 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
ARPA
Common
Distribution
Unit for Gyro
Gyro 1 Gyro 2
TrackPilot
ECDIS
Gyro 1
Gyro 2
Gyro 1 Gyro 2
First priority
Gyro selector
(Selected gyro
(Gyro 1 or Gyro 2)
Posn
Spd/Cse
Gyro data distribution for track control system