Accession Number : ADD004365

Title :   Hydroways.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Cobb,A Donn

Report Date : 16 Aug 1977

Pagination or Media Count : 7

Abstract : An acoustic navigation system for marking channels is utilized for providing safe entry and exit from harbors. The system has a plurality of pairs of acoustic projectors aligned on opposite sides of a channel. Each pair is spaced from corresponding pairs, a predetermined distance along the sides of the channel. A first projector in each pair provides an acoustic source for a period of time. The other projector in the pair provides acoustic sources spaced at predetermined intervals both before and after the signal from the first projector. A vessel equipped with receiving and display equipment determines its own location within the channel from the received acoustic signals. (Author)

Descriptors :   *Patents, *Navigational aids, *Acoustic navigation, *Harbors, Marine transportation, Acoustic signals, Position finding, Position location reporting system

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE