Semicircular component of error
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4-2-340
Quadrantal component of error
Octantal component of error
That sinusoidal component of the error versus true bearing curve taken over the full 360 degrees range of bearings which shows 2, 4 or 8 zeros respectively.
Note: These errors are a form of site error and are of particular importance on vessels and aircraft.
Reference: B.S. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
