Error in bearing

From International Dictionary of Marine Aids to Navigation
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The angular difference, expressed algebraically, between the observed bearing and the corresponding true bearing.

Note: This error is in general the sum of two terms, an installation error that can be corrected and an unknown random error.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM