All anglers on the boat have to have be National Salt Water registered. Here's a response I got from MD DNR. Hello Ron, thanks for writing. Non-licensed anglers on a decaled boat would indeed need to register with Maryland if they are fishing in any tidal waters. The registry web address is http://dnr.maryland.gov/swregistry.asp I think last year NOAA used wording that said if you target anadromous fish then you had to register but this year we simplified it to all tidal and saltwater fishing.