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Chapter: 5. Calibration procedure
Step 2b. Semi Automatic calibration:
The vessel is made to sail a known distance and course in both directions. This to remove any water current
factors from the speeds.
The 1st leg will show a dierent speed to the 2nd leg, however the direction changes in the second leg so that
the average is correct.
The speed can be calibrated as follows:
1. Assuming you have performed step 1 “Heading Error”, plot a known distance on the chart. Enter this value
into the on menu 1.
.
A
B
Figure shows plotting a calibration path on
the chart.
The leg should take at least 5 minutes to sail
(distance can be shorter when sailing slowly).
Depth should be < 50 m to ensure that bottom
track also calibrates correctly.
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