Error curve

From International Dictionary of Marine Aids to Navigation
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Error curve (of a direction finder)

A curve applicable to a particular direction finder and which shows the installation errors as a function of some specified variable.

Note: Use is commonly made of a family of such error curves as a function of true bearing with frequency as the parameter.

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