When use mast strobe light?
The only thing I could find in what Gordon quoted which might permit/justify a strobe was the line:
"(d) a signal made by radiotelegraphy or by any other signaling method consisting of the group . . .- - -. . . (SOS) in the Morse Code;"
Which hardly seems to make a strobe become ''valueable'' on the masthead; although I -did- come across a mention of one boat in distress which did exactly that (used the strobe to flash an SOS). Aside from that one mention and two hearing of strobe used by single-handers as a nighttime ''see me'', that''s all I''ve been able to find about it -- accept that Aqua Signal offers it as an option for their tri-colors.
Just for grins I will send Aqua Signal a message and ask them why they offer it and what its -approved- use would be (smile). I''ll report back when/if they reply.