Depth sound indicator

Details Depth sound indicator Depth sound indicator

1977-02-10

1978-06-27

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

G01S 966

Patent

active

040978362

ABSTRACT:
An audible tone depth sounder indicator apparatus changes the repetition rate of its audio output to indicate deviation in actual water depth from a selected reference depth. A change in tone of the audible output distinguishes positive and negative deviations from the reference depth, and there is no audible signal when actual depth equals the selected reference depth.

REFERENCES:
patent: 2403527 (1946-07-01), Hershberger
patent: 2728900 (1955-12-01), Ross
patent: 2998591 (1961-08-01), Lovett
patent: 3223965 (1965-12-01), Beebe
patent: 3493920 (1970-02-01), MacMunn
patent: 3706068 (1972-12-01), Bradshaw et al.

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