different between bathometer vs fathometer

English

batho- +? -meter

bathometer (plural bathometers)

An instrument that measures the depth of water, used especially to measure the depth of ocean water.

fathom (“nautical length measurement used for depth”) +? -meter

fathometer (plural fathometers)

(nautical) A depth finder that uses sound waves to determine the depth of water.
- 1977, Richard O'Kane, Clear the Bridge: The War Patrols of the U.S.S. Tang (Ballantine Books, 2003), page 347:
  A Fathometer is just a vertical echo-ranger; its pings would sound the same and could drive a submarine out of position just as effectively as horizontal echo-ranging and might even make a contact.

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