MMSI DSC

USCG Navigation Center specific to MMSI’s - https://www.navcen.uscg.gov/mmsis-for-recreational-vessels.

DSC (digital selective calling) allows the radio to transfer information digitally, including a digital distress alert to the USCG. Part of that alert is a nine-digit Maritime Mobile Service Identity (MMSI) number that identifies your boat.  Here is a good overview of important requirements in setting up your VHF Radio:  

• https://www.joecel.com/GMDSSTaskForce/MMSI%20Working%20Group/MMSI%20Reference%20documents/Explains%20DSC%20and%20GPS%20from%20CG.mov

If you plan to visit or communicate in a foreign port including Canada, Mexico, Bahamas, and the British Virgin Islands you are legally required to obtain a Ship Station License from the FCC. The FCC will need to issue an appropriate MMSI with the License.

Recently it has been approved for individuals to get an MMSI for a Handheld Radio registered to the individual NOT a vessel.  This registration is handled by the FCC.