Lowrance electronic HDS 10 Manual Do Utilizador

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%.