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