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• n  depth finder for determining depth of water or a submerged object by means of ultrasound waves

• No leadsman need stand in the bow to take soundings, for the navigator has an acoustic-electric fathometer to tell him, at the press of a button, how much water is beneath the .

• sonic depth finder

Quotes

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• Don Walsh in NPR
  As we approached the bottom, we pretty well knew what the water depth was. And when we got to about 35,000 feet, I turned on the fathometer, which would allow us to get a trace or a printout on a chart that shows you the bottom coming up,...