Fraunhofer region

From International Dictionary of Marine Aids to Navigation
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For a transmitting antenna system, the region which is sufficiently remote from the antenna system for the wavelets arriving from the various parts of the system to be considered to follow parallel paths.

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