From International Dictionary of Marine Aids to Navigation
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The numerical value of a correction is the best estimate that can be made of the difference between the true and the measured value of a parameter. The sign is such that a correction that is to be added to an observed reading is taken as positive.

Source: Nick Ward, Vicechair, IALA e-Nav Committee, March 2009

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