On Aug 24, 4:57 am, "KLC Lewis" wrote:
....
I seem to recall reading, somewhere, that sailing vessels under 39' can
combine the stern and steaming lights into the masthead tri-color. But I may
be mistaken.

23 (c) A power-driven vessel of less than 12 meters in length may, in
lieu of lights prescribed in paragraph (a) of this Rule, exhibit an
all-round white light and sidelights.

Which I take to mean that you could use your mast head _anchor_ light
and sidelights under power.

-- Tom.