Sonic 2024 - Table 11: Gyro Calibration Method 2 Computation

The example, below, will illustrate the math involved.
Figure 121: Gyro Calibration Method 2 example
A to A'
1.0 metres
B to B'
1.5 metres
Side a
5.0 metres
Side b
1.5 – 1.0 = 0.5 metres
Angle b'
Arctan 0.5/5.0 = 5.7
°
Ship Azimuth = 270° + 5.7° = 275.7°
Table 11: Gyro Calibration Method 2 computation
Figure 122: Idealised concept of Gyro Calibration Method 2
In this example, the vessel heading for this set of readings is 275.7°; this would be compared to the
gyro reading recorded at the same time the offsets were measured.
In the above example, if the bow was further out from the quay than the stern, the angle b' would
be subtracted from the azimuth of the quay, i.e. 270° - 5.7° = 264.3°.
Page 113 of 210
Version 5.0 Rev r002
Date 05-08-2014