• Bring the boat up to cruising speed (above 5 knots), then
• Select the SOG reference option
When the calibration is completed the Boat speed calibration scale
will show the adjusted percentage value of the boat speed.
Distance reference
Allows you to calibrate the log via a distance reference. You will
need to complete consecutive runs, under power at a constant
speed made along a given course and distance.
Ú
Note: The distance should be greater than 0.5 NM, ideally 1 NM.
To eliminate the effect of tidal conditions it is advisable to
perform at least two runs, preferably three, along the measured
course.
Referring to the diagram, A and B are the markers for each run. X is
the actual distance for each run.
• Enter the desired distance in nautical miles that you would like to
calculate the distance reference over
• When the boat gets to the predetermined starting position of the
distance reference calculation, start the calibration timer
• As the boat passes marks A and B on each run, instruct the
system to start and stop and finally OK to end calibration.
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.
Software setup| AP44 Operator Manual
29
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