How would you define hydrophone?
As far as I know, it is a microphone with the proper acoustic impedance match to operate effectively underwater.
The exact composition of the hydrophone can vary widely, piezoelectric, ceramic, etc., but it is still a hydrophone. They can be omni-directional, fixed, or directional (steerable).
You may be entirely correct as I am 20 years out of the service, but I'd hate to think that I'm so far out of touch with current technology that I wouldn't be at least peripherally aware of something which has eliminated hydrophones altogether.
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In the month of July of the year 1348, between the feasts of St. Benedict and of St. Swithin,
a strange thing came upon England...
My U297 build thread
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