19. Navigation Sensors
19-11
Alarm related to SOG, COG, speed, heading, ROT, drift and docking speed components
It is possible that the operator has not chosen any speed or heading sensors, or that the chosen sensors do not have
any valid values. This kind of a situation is critical for the system, because it cannot even perform dead reckoning.
When no speed source is available, the system generates the alarm "2001 No speed available". When no heading
source is available the system generates the alarm " 2002 No heading available".
The system may find that SOG and/or COG from the sensors are unreliable, at which time it generates the alarm
"2013 SOG&COG unreliable". Note that the source of SOG and COG is not only speed and course sensors, but the
source can also be position-fixing equipment. For more information about source priority for SOG/COG, see section
19.5 Source of SOG, COG, Speed, Heading, ROT, Drift and Docking Speed Components.
Verify and choose valid sensors in the Speed/Course and Pos pages of the Sensors dialog box for SOG and COG
used by the system.
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