Mooring/anchor a houseboat, how long?

[pstew96]

I know someone who wants to anchor a houseboat for the summer inside a small marsh in the GSB, is this legal? is there some kind of law where you cannot do this and/or a time limit? What else could you do with a houseboat around here?

 

[CurrentSea]

As long as he has the all around white light, not breaking any laws.