https://www.usps.org/e_stuff/documen...oating-law.pdf
Headway speed:defined as the minimum speed a vessel may be operated to maintain steerageway,but not to exceed 6 miles per hour.
• Don’t operate your boat at more than headway speed when within 150 to 300 feet of shorelines used as swimming areas.
• Use headway speed when within 150 feet of a marina, ramp, raft or float.
• Use headway speed within 150 feet of a swimmer.
......
• Don’t operate at more than headway speed when within 150 feet of a swimmer, the shore, or a moored
vessel.
I'll let you all peruse this document but I see no mention of a 150 foot rule that pertains to vessels that are on plane and underway. I see mentions of fixed objects and moored vessels, but that is it. Check it out and let me know. I, along with Woodsy, was told many times that the 150 foot rule, with concern to vessels underway, above No Wake speed, is totally unique to New Hampshire inland waterways. If somebody can prove otherwise I will stand corrected.