PeteAlbright wrote:
On ships with "all around" lights mounted close on the mast, it is common to
have two lights mounted on each side of the mast. Two lights mounted 12"
apart should not be confusing, and while a sail may block a light, it would
also be illuminated by it.

Pete Albright
Tampa, FL

I'd be careful on this. Although I won't disagree that on some ships,
this is true, due to considerations of construction, this requires
regulatory agreement and is not the norm.
Also, it is quite possible that some may see various signal light
"trees" on either side of a ship mast, which they may mistake for
duplication, wherein reality, they are separate signals for some
specific locale or function.

otn