User's Manual

Calibration
17
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6 Calibration
Once the Race Master has been installed on the vessel and Auto
Networking has been completed it is necessary to calibrate the
compass. It is not safe to use the Race Master for navigational purposes
until calibration has been carried out correctly.
To compensate for deviation caused by magnetic objects on the boat, it
is necessary to carry out a deviation correction turn.
The compass reading may be set to the correct heading.
To begin the calibration process
From the Line Bias (LiNE) page, press and hold for 2 seconds to
enter Setup.
Press repeatedly to scroll to the Heading chapter.
To complete a deviation correction turn
Press to scroll to the DEV parameter.
Press to enter Compass Calibration Mode.
Turn the vessel slowly keeping the speed below 4 knots and
taking approximately 2 minutes to complete 360 degrees. Keep
turning the vessel until the display changes to show a value
(usually about 1.25 turns).
Note: If the rate of turn of the vessel is too fast the display will show
“FAST TRN”. It is not necessary to abandon the turn at this stage but do
lessen the rate of turn by reducing speed or widening the turning circle.
Press to exit Compass Calibration Mode.
Then, to align the heading
Using a hand bearing compass or an external fixed compass, steer the
vessel on a known heading.
Warning: Only use an external fixed compass as a known heading if you
are certain it has been checked and compensated.
Press repeatedly to scroll to the Compass Offset page.
Press to enter Edit Mode.
Press or to change the displayed heading (in small text)
to the known correct value.
The display shows the offset entered.
Press to exit Edit Mode.
Press and hold to exit Setup and return to normal operation.