YUP..M & M. This discussion is interesting but probably not Resolvable. FWIW: My boat is a 20' Donzi Classic......And has a FOREDECK.
I have a Combination Red/Green at the bow.
I have a removable "mast" just ahead of the windscreen with TWO WHITE lights at the top. One is a white light facing foreward that exceeds 180 degrees. That same light can be switched to make it a full 360 degrees..ie..Combined: Now an "Anchor Light".
The boat also has a White light "built in" to the TRANSOM which is less than 180 degrees.
When I am underway at night...I have the Red/Green ON, the Mast Light ON ... @ something OVER 180 degrees facing forward.....AND the White Transom light ON. The factory switches on the dashboard pretty much dictate what my choices are. NB
I Can't find this EXACT combination of lights in the Boating Handbooks. OH WELL. You do the best you can......NB
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