Actual range of a sound signal

From International Dictionary of Marine Aids to Navigation
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3-1-245

The maximum distance, measured from the point of emission, at which it is possible to understand the information contained in the signal under the existing conditions of propagation and listening.




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