Furuno FEA-2107 - Filter and Automatic Route Steering

19. Navigation Sensors
19-17
19.7.1 Filter and automatic route steering
The filter can operate based on only one position sensor and one gyro. However, this minimum selection is not
suitable for automatic route steering or program track, which both require an independent speed source. With
automatic route steering the minimum selection is for GOTO Waypoint:
• One position sensors, gyro and log or
• Two position sensors and gyro
• And for GOTO Track:
• One high-precision position sensor, gyro and log or
• One high-precision position sensor, secondary position sensors and gyro
Source of position indicates what kind of sensors the filter is using for position calculation. The permanent
indication is shown at the top right hand corner:
• FILTER: There is no high-precision position sensor chosen and available for the filter.
• FILTER HIGH: There is a high-precision position sensor chosen and available for the filter. It is possible to use
track steering modes which require accurate position (Goto Track, Program Track).
Filter state, automatic route steering and alarm
Filter state, automatic route steering and alarm
Alarm Meaning
2000 Filter: Pos unreliable The filter is not able to calculate the position from the connected sensors.
2006 Route: CRS jump possible Generated after alarm 2000 is displayed. It reminds you that if you want to
continue automatic route steering you need to choose one of the position
sensors. Then, most probably your ship will perform a turn as a
consequence of new position.
2470 Disabled: Needs filter on You tried to enable automatic route steering without Kalman filter
positioning.
2475 Route: Needs filter ON Filter is lost during automatic route steering.
2476 Route: Needs log sensor Log device is lost during automatic route steering and your remaining log
selection doesn’t meet minimum requirements.
2490 Disabled: Needs log sensor You tried to enable automatic route steering without an independent speed
source.
2491 Disabled: Needs diff pos. You tried to enable automatic route steering for GOTO Track mode without
a high-precision sensor.
2492 Route: Needs diff pos. You lost high-precision sensor in automatic steering, GOTO Track mode,
and remaining sensor doesn’t meet the minimum requirements for high-
precision sensor.
2493 ProgTrack: Needs Filter
ON
You lost the Kalman filter position during program track.
2494 ProgTrack: Needs diff pos. You lost high-precision position sensor during program track and remaining
sensor doesn’t meet the minimum requirements for high-precision sensor
remaining selection doesn't meet the minimum.
2495 ProgTrack: Needs log
sensor
You lost a log device during program track and your remaining log devices
selections don’t meet the minimum requirements.