Angular deviation loss

From International Dictionary of Marine Aids to Navigation
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3-1-140

The difference in level, expressed in decibels, of the emission or response on the principal axis of a sound source or receiver and the emission or response in a specified direction.




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