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Water speed off set
Water speed calibration is used to adjust the speed value from the paddle wheel to match
the actual speed. This can be measured either from the GPS speed over ground (SOG) or by
timing the boat over a known distance. Water speed calibration should be performed with as
little wind and current movement as possible.
Select Auto correct to match water speed to ground speed
Manual calculation. If in average the water speed reads 8.5 knots and SOG records 10 knots.
Increase the offset to 117%. The calculation is:
Difference in speed
Paddle wheel speed
x 100.
If water speed is lower than SOG then increase the calibration value.
Default is 100 % with ability to calibrate to +/-20%.