No, this isn't about risqué innuendo.
Boats with names registered thru Coast Guard Documentation
or FCC Ship's Radio
Licenses will be able to encode their name in their AIS
B data stream. Others will use a state registration
number, and called "US#md8181nt" for example, when contacted about a problem by another vessel. If they dial your MMSI number, your VHF
will ring like a telephone, and the radio
will switch to channel 70. But if they call you on channel 16, you will have to be paying attention. This survey
is asking for a count of boats in the US who may not have a registered name.