Gyro-Associated Alarms - Furuno FEA-2107 Operator's Manual

Sensors dialog box
The Speed/Course page of the Sensors dialog box shows gyro indication as follows:
•
(active): The system uses value from this gyro which is chosen by "First priority Gyro Choose selector".
•
(backup): The system uses value from this gyro which is NOT chosen by "First priority Gyro Choose selector"
In the example screen at left in the figure below, heading information from Gyro 2 is used by a Trackpilot and the
ECDIS. The indication "(active)" in the Gyro 2 field indicates that the system uses user-chosen gyro as source of
heading (State of "First priority gyro selector" switch). In this case the text "(2)"appears at the upper right corner.
In the example screen at right in the figure below, heading value from Gyro 1 is lost. In this case, the system
automatically chooses Gyro 2 to be used as the source of heading. The indication "(backup)" in the Gyro 2 field
means that a backup gyro is used.
19.6.2

Gyro-associated alarms

When no gyro value is received from gyro chosen by "First priority gyro selection", alarm AL 10 (Missing working
gyro) is generated at the Trackpilot.
When no gyro value is received from a gyro not chosen by "First priority gyro selection", alarm AL 11 (Reference
gyro missing or Compass comparison alarm) is generated at the Trackpilot. Note that alarm AL 11 is activated also
if the deviation between Gyro 1 and Gyro 2 is too large (default is 12º).
ECDIS generates alarm 4005 for missing Gyro 1 and alarm 4006 for missing Gyro 2. If the deviation between gyro
1 and gyro 2 is over 5º, then ECDIS generates the alarm 2004 Gyro data unreliable.
19. Navigation Sensors
19-15