Does My Registered Port Have to Be Where I Keep My Vessel Most of the Time?

No, it does not. According to the Code of Federal Regulations, 46 CFR 67.119, “the hailing port must be a place in the United States included in the U.S. Department of Commerce’s Federal Information Processing Standards 55DC” and “the hailing port must include the State, territory, or possession in which it is located.” 

There is no requirement that it must be the port that you use the most, that your vessel spends a majority of its time docked at, and so forth. 

You can use this form to change your vessel’s name or hailing portAdditionally, vessel owners can use this form to apply for their vessel documentation.