Technically, it is a RAM—R
icrophone...and the Mic is redundant.
It is basically a microphone with speaker and often limited controls, like channel up/down and volume up/down, that can be mounted away from where the main VHF unit is located. Some are wireless, others are wired, and some have more features than others.
The one I have for my iCom has limited DSC functionality as well as squelch, volume, channel, scan, etc., controls and looks like this:
They are not interoperable between brands.
Installing one usually consists of running a pre-terminated wire that ends in a socket from the rear of the radio to someplace in the cockpit.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.