2.7 Calibrating the Sensor
Although every sensor module is calibrated at the factory, hard
and soft iron effects on your vessel can distort the local magnetic
field, causing errors in the reported heading. These errors are
minimized by mounting the sensor module in a suitable location
and are further removed by GyroTrac’s autocalibration feature,
which compensates for magnetic distortions.
After installing the GyroTrac, you must calibrate the sensor as
described below and achieve a good calibration score to ensure the
highest degree of accuracy.
1. Select a calm day and a clear area. Avoid excessive
pitching and rolling, as this can distort the
compensation data.
2. Apply power to the GyroTrac and note your
approximate heading so that you will know when
you have completed a full circle.
3. Steer your vessel at a slow, steady speed through a
full circle that takes at least 2 minutes to complete.
(Try to time your turn so that it takes 30 seconds or
more to turn 90º.) After completing a full circle,
continue the process with a second circle. The
circles do not need to be perfectly round as long as
you make a complete 360º turn.
4. Once you have completed two full circles, your
compass should be calibrated. Check the
calibration score as described on the following
page.
54-0161
42
TracVision G6 Technical Manual
You must calibrate the GyroTrac
sensor after installation so that it
can compensate for any magnetic
distortions.
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