ASA and PSIA Instructor
Join Date: Apr 2000
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It is difficult to tell for sure from the text of the ColRegs whether it would be permissible to have green / red lights at the masthead on a power boat, above your steaming lights,....
The NAVREGS rules don't attempt to tell you EVERYTHING you cannot do, they tell you what you MUST or MAY do. The rules for power vessel sidellights and stern light are not compatible at all with the concept of a mast-head tricolor. A sailboat under power is simply another power vessel.
Certified...in several regards...