Thread: Headway Speed
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Old 08-25-2008, 07:55 AM   #21
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Post Knots vs. MPH correction

Quote:
Originally Posted by Acres per Second View Post
...New Hampshire is giving you a break: the Federal law, upon which most state laws are based, stated five knots, which is about one MPH slower...
Actually, 5 knots equals 5.8 MPH, a difference of only 2/10's of a MPH, not the 1 MPH that you indicate.

Therefore, for all practical purposes, 5 knots does equal 6 MPH, and if I remember correctly the State chose to use MPH for inland waterway RSAs as virtually all pleasurecraft that ply these water (at least at the time) utilized factory installed speedometers that generally read in the MPH range.
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