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Determining the Ship’s Position Using Relative Bearings,
Continued
Figure 8-11. PMP set up for relative bearing navigation.
Accuracy
The results of a relative bearing fix are directly related to the accuracy
of the deviation table. If the compass deviation listed is in error by 2°,
then all bearings may be off by 2°. There is a way to check the
accuracy of the deviation tables for any area in which the ship is
operating. Comparing the deviation table to the entries in the Magnetic
Compass Record Book may at times give an indication to the accuracy
of the deviation tables. Often, interpolation is required. Any decision to
deviate from values given in the deviation tables must be made by the
navigator and recorded in the Standard Bearing Book.
8-23
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