In Canada, if you wish to legally use your VHF in the USA and other countries you need to obtain a radio license for the radio, which IC will then grant you a call sign, the once you have a radio license in Canada you are supposed to use this call sign in all VHF transmissions.
http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf08764.html If your just using it in Canadian waters no license is required and you can just use the boat name as others had commented on.
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