Setup and Calibration
4.2Speed Calibration
To ensure that the Boat Speed (and Distance) is accurate it is necessary to calibrate the speed to take into account variations in water flow between different hulls. Adjustment is made by multiplying the Speed through the Water (V) by a percentage Calibration Factor.
It is essential to carry out this procedure at a time where little or no tide is flowing.
To enter a Log Calibration Factor
With the vessel under power, steer a straight course allowing the Boat Speed reading to settle to a constant value. Check the GPS is showing a constant SOG.
Press and hold the 
button for 2 seconds to enter Setup
Press the 
button repeatedly to scroll to the “SETUP/SPEED” Chapter
Press the 
button to advance to “SPEED/+0%” Page
Press the 
button to enter Edit Mode
Press the 
and 
buttons to change the Calibration Factor until the Speed reading displayed matches the GPS SOG reading
Press the 
button to exit Edit Mode
Press and hold the 
button to exit Setup and return to normal operation.
Should you be unable to carry out this procedure due to strong tidal conditions or poor GPS information there is further information regarding Speed Calibration using a measured distance on the Tacktick website at www.tacktick.com.
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