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from what i understand, DSC is not for emergency only.
If your gps is capable, it can display your freind's location on your maps via DSC if you program in their mmsi number.
I also belive that you are correct in your assessment that "msi number is kind of like your cell phone number for the radio and can call any other mmsi number"
But I have no first hand experience, only what I have read.
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