I can almost certainly tell you from first hand experience, but not in Boston, that the USCG does not use personal pagers other than your plain old text message.
Well let me modify that slightly. They also issued pagers if needed but they were the same pagers that anyone could go out and get, not one that used RF. Now the CG Fire Departments or Police Departments or whoever has the contract for those services might use them, but your duty boat crew STA personnel don't.