Hydroways

Details Hydroways Hydroways

1976-09-01

1977-08-16

Farley, Richard A.

Communications: electrical

Selective

Having indication or alarm

30 3A, G01S 518

Patent

active

040429040

ABSTRACT:
An acoustic navigation system for marking channels is utilized for provid 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.

REFERENCES:
patent: 2515472 (1950-07-01), Rich
patent: 3270345 (1966-08-01), Schauffler
patent: 3723957 (1973-03-01), Damon

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