4.2 Speed 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 the Speed Calibration 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 Raymarine website.
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