Answer:
1. Both Al and Sten, being on port, must keep clear
of all starboard
boats as per rule 10. Al must
of course, also keep clear of Sten who is leeward
boat to him.
2. Possibly. Right-of-way boats coming at Sten could
rank as an
obstruction requiring him to "make
a substantial course change", but
the boats are converging so rapidly (a combined 10
knots or more), that
it may well be too late for Al to respond without Al
and Sten both
breaking rule 15
in regards to
spinnaker
boats over which they would suddenly have acquired
right of way.
3. Yes. The starboard boats rank as obstructions
to Al and Sten.
Thus, rule 19
(Room to Pass an
Obstruction) applies, and if Sten passes to leeward
of them, he must give Al room to do likewise.
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