B&G Vulcan Series, Instruction Manual

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SOG as boat speed and COG as heading
Use SOG as boat speed
If boat speed is not available from a paddle wheel sensor, it is
possible to use speed over ground from a GPS. SOG will be
displayed as boat speed and used in the true wind calculations and
the speed log.
Use COG as heading
If heading data is not available from a compass sensor, it is possible
to use COG from a GPS. COG will be used in the true wind
calculations.
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Note:
The autopilot cannot be operated using COG as the
heading source. COG cannot be calculated when stationary.
GPS offset - start line configuration
In order for the start line feature to work at its optimum, the exact
position of the vessels bow must be known. This is achieved by
entering position offsets for the GPS sensor. These offsets combined
with heading data will allow the software to accurately determine
the bows distance from the start line.
GPS Bow Offset
Enter the distance from bow to GPS (always a positive value)
System setup | Vulcan Series Installation Manual
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