Furuno FEA-2107 Operator's Manual page 449

28. Trackpilot
Alarms when automatic route steering cannot be accepted
There are several reasons why the requested route steering mode could not be accepted:
Alarm "2467 Disabled: Steering off", which informs you that the ECDIS didn't have steering controlling
permission at the time of request. Check that you have properly enabled the Trackpilot for steering.
Alarm "2470 Disabled: Needs filter on", which informs you that you didn't have the Kalman filter operative at the
time of request. Route steering requires that you use the Kalman filter, because the filter eliminates sudden jumps of
the position and thus prevents unpredictable manuevers of own ship. Check your selection of sensors.
Alarm "2490 Disabled: Needs log sensor", which informs you that the Kalman filter did not have an independent
speed source. You need either a log, a dual-axis log or two position receivers. Check your selection of sensors.
Alarm "2491 Disabled: Needs diff Pos", informs you that the Kalman filter did not have high-precision position
sensor for "Goto track" steering mode. Chosen sensors must include at least one high-precision sensor.
Alarm "2477 Disabled: Out of channel", which informs you that the current location of your ship is not inside
channel of a monitored route.
Alarm "2468 Disabled: Out of course", which informs you that the difference between current heading of own ship
and the required set course to start the route steering is greater than set by the user in the route start limit angle of
Route Parameters.
Alarm "2464 Route: No chosen route", which informs you that there is no route chosen for Route Monitoring.
Alarm "2465 Route: Illegal WP", which informs you that there is a route chosen for route monitoring, but the
selection of the next or final waypoint is missing or illegal.
Alarm "2499 Disabled: Needs good Pos", which appears if the Kalman filter did not have a high-precision position
sensor for route steering, and position discrepancy limit between primary and secondary sensors is exceeded.
Alarm "2502 Disabled: Need higher Spd", which appears if the speed used by the Kalman filter calculation is
below the limit set for track steering in the installation parameters.
Alarm "2508 Disabled: Need sog/cog ref", which appears if neither Speed Over Ground (SOG) nor Course Over
Ground COG) is available from position sensor(s) or bottom track of dual-axis log.
Alarm "2510 Disabled: Out of turn", which appears if Goto WP or Goto Track button was pressed when the
route monitoring of the system detects that vessel is turning, but own ship location is out of turn. Check and reset
correct "To WP" for route monitoring.
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