Furuno FEA-2107 Operator's Manual page 535

Alarm number 2504:
------------------------------------
THIS IS INSTRUCTION TO CHANGE
STEERING MODE. THIS ALARM IS
GENERATED IF THERE ARE NOT
SUFFICIENT SENSORS AVAILABLE TO
CONTINUE PROGRAM TRACK
Alarm number 2505:
------------------------------------
THIS IS INSTRUCTION TO CHANGE
STEERING MODE. THIS ALARM IS
GENERATED IF THERE ARE NOT
SUFFICIENT SENSORS AVAILABLE TO
CONTINUE GOTO TRACK
Alarm number 2506:
------------------------------------
THIS IS INSTRUCTION TO CHANGE
STEERING MODE. THIS ALARM IS
GENERATED IF THERE ARE NOT
SUFFICIENT SENSORS AVAILABLE TO
CONTINUE GOTO WP OR GOTO TRACK
Alarm number 2507:
------------------------------------
'GOTO TRACK' MODE CANNOT CONTINUE
WITHOUT SOG/COG REFERENCE AVAILABLE
FROM POSITION SENSOR OR BOTTOM TRACK
OF DUAL AXIS LOG.
Alarm number 2508:
------------------------------------
GOTO TRACK STEERING MODE CANNOT BE
ACTIVATED WITHOUT SOG/COG REFERENCE
AVAILABLE FROM POSITION SENSOR OR
BOTTOM TRACK OF DUAL AXIS LOG
PROGTRACK: USE RADIUS CTRL.
ROUTE: USE GOTO WP
ROUTE: USE RADIUS CTRL.
ROUTE: NEED SOG/COG REF.
DISABLED: NEED SOG/COG REF.
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30. Alarms
30-33