Two features that I find most important:

Truly submersible, not water resistant. I want to be able to call for help while I'm bobbing around in my life jacket.

Lithium-Ion battery, not ni-cad. Remember the old, bulky cell phones that went dead after 3 phone calls? The new phones have L-I batteries that are smaller and last for days.

I recently got a ICOM IC-M1V.
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