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344 · Navigation Sensors
Source of position indicates what kind of sensors the Filter is using for position calculation. The permanent
indication is available in upper right hand corner:
· FILTER, there is no high precision position sensor selected and available for Filter.
· FILTER HIGH, there is high precision position sensor selected and available for Filter. It is possible to use
track steering modes which requires accurate position (Goto Track, Program Track).
If you try to enable automatic Route Steering without Kalman filter positioning, the system generates alarm "2470
Disabled: Needs filter on". If you try to enable automatic Route Steering while ship is located outside channel
limits of Monitored route, the system generates alarm "2477 Disabled. Out of channel". If you try to enable
automatic Route Steering without independent speed source, the system generates alarm "2490 Disabled: Needs log
sensor". If you try to enable automatic Route Steering for GOTO TRACK mode without high precision position
sensor available, the system generates alarm "2491 Disabled: Needs diff pos.".
If you loose during automatic Route Steering the Kalman Filter position, the system generates alarm "2475 Route:
Needs Filter ON". If you loose during automatic Route Steering a log device and your remaining selection doesn't
meet the minimum, the system generates alarm "2476 Route: Needs log sensor". If you loose during automatic
Route Steering GOTO TRACK mode a high precision position sensor and your remaining selection doesn't meet the
minimum, the system generates alarm "2492 Route: Needs diff pos.".
If you loose during Program Track the Kalman Filter position, the system generates alarm "2493 ProgTrack: Needs
Filter ON". If you loose during Program Track a log device and your remaining selection doesn't meet the
minimum, the system generates alarm "2495 ProgTrack: Needs log sensor". If you loose during Program Track a
high precision position sensor and your remaining selection doesn't meet the minimum, the system generates alarm
"2494 ProgTrack: Needs diff pos.".
If the filter is used with automatic Route Steering, then in case of alarm "2000 Filter: Pos unreliable" all position
sensors and filter itself are changed to OFF state and the system continues with backup dead reckoning based on
selected speed / course sensors. It is recommended that you leave then automatic Route Steering and continue using
more traditional steering mode during the period you solve the reason for alarm 2000. If you don't leave automatic
Route Steering, then the system will repeat alarm "2475 Route: Needs filter ON" every 15 seconds. Also after
alarm 2000 the system generates alarm "2006 Route: CRS jump possible" to remind you that if you now continue
automatic Route Steering and just select one of the position sensors, then most probably your ship will perform a
turn as a consequence of new position. As summary after the alarm 2000, the user should leave automatic Route
Steering and evaluate which sensor caused the problem. If the ship position from the a position sensor is acceptable,
switch it on. Don't select any sensor which causes jumping. Then you can select the filter ON again and continue
automatic Route Steering.