From International Dictionary of Marine Aids to Navigation
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A phase-meter used for the display of Decca position-line information within a pattern.

The readings of a decometer and the lane identification meter together determine the line of position on which the craft lies.

Reference: B.S. (modified)

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

Centre of buoyancy


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