Re: Rule 23a question
I found it!
"(d) A power-driven vessel when operating on the Great Lakes may carry an all-round white light in lieu of the second masthead light and sternlight prescribed in paragraph (a) of this Rule. The light shall be carried in the position of the second masthead light and be visible at the same minimum range."
Very subtle point.
Last edited by davidpm; 12-19-2012 at 12:36 AM.