From International Dictionary of Marine Aids to Navigation
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A radio determination system which measures distance and usually direction by a comparison of reference signals with the radio signals reflected or retransmitted from the object whose position is to be determined.

Reference: I.T.U. (modified)

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

charge current


Time period

roll period


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