Seatrial and Calibration
29
7.3
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 when little or no tide
is flowing.
To take account of tidal flow, the calibration run should be carried out
twice, once with the tide and once against the tide. The calibration
percentage factor should then be set to the average of the factors
determined by the two runs.
To enter a Speed Calibration Factor:
With the vessel under power, steer a straight course and allow the boat
speed reading to settle to a constant value. Check the GPS is showing
a constant SOG.
Press and hold
to enter Setup
Press
repeatedly to scroll to the
Speed
chapter
Press
repeatedly to scroll to the
Speed Calibration
page
Press
to enter Edit Mode
Use
and
to change the displayed % value until the speed
reading shown (in small text) matches the SOG from the GPS.
Press
to exit Edit Mode
Press and hold
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.
Содержание T075-916
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