A form of directional receiving antenna consisting of two fixed independent crossed vertical loops at right angles to one another. The loops are coupled to a common output through the field coils of a radiogoniometer.
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