Simrad IS40 PRO, Operator'S Manual

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Setup | IS40 PRO Operator Manual
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 also in the true wind calculations
and the speed log.
Manual adjustment of boat speed
Adjust the boat speed manually by selecting the Boat speed
percentage slider. Adjust the percentage up or down as desired.
Confirm the value. Select OK once complete.
Distance Reference
This option enables the user to calibrate the log accurately and
simply. Calculations are performed by the display that works out the
boat speed over a known distance.
To calibrate the boat speed via a distance reference you will need to
complete consecutive runs, under power at a constant speed made
along a given course and distance.
¼
Note:
To eliminate the effect of tidal conditions it is advisable to
perform at least two runs, preferably three, along the measured
course.
Enter the desired distance in nautical miles that you would like to
calculate the distance reference over.