If physical adjustments are required, they should be made and the calibration process repeated. If
the adjustment is determined to be minor and can be accounted for in the survey software, the
correction value should be entered and then verified using the calibration process. This check of the
calibration value can be an abbreviated version of the calibration process detailed above.
Figure 119: Gyrocompass Calibration method 1
• Quayside Benchmarks have known geodetic positions.
• Measure Range and Bearing to reflectors on vessel centre line.
• Using Range and Bearing to reflectors, determine geodetic position for
reflectors.
• Calculate bearing from stern reflector to bow reflector will give the true
heading of the vessel.
• True heading of vessel is then compared to gyrocompass reading taken at
the same time as the Range and Bearing measurements.
• Benchmarks do not have to be on the quay, but should be in a position to
give accurate Range and Bearing to the reflectors.
Page 111 of 210
Version 5.0 Rev r002
Date 05-08-2014
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