Okay, I'll leave it at this.
It has always been my understanding that federal law supersedes state law, and that state law supersedes local ordinance. (District Court, Superiror Court, State Supreme Court, Federal Court...etc)
Given that formula, I don't see how NH RSA supersedes Federal Law that has adopted COLREGS.
Hopefully neither of us will be stopped for a violaton!
edit: or
If Federal regualtions are lax, such as with an anchor, I go with whatever regulation is the most stringent! Federal regs, no anchor, State regs, anchor required! So, an anchor is required!