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I worked on a project that did this for the Navy while I was in university 20 years ago. Handheld units and buoys could get other's range and send text messages

I worked on a project that did this for the Navy while I was in university 20 years ago. Handheld units and buoys could get other's range and send text messages with sonic clicks.

jcun4128 5y ago
That's really cool, yeah that seems to be a thing you have to deal with the changing medium (air and water).