PART 2
If the conditions for rule 19.2(c) to be applicable have been met, and the boat astern wants to become overlapped between the boat ahead and the continuing obstruction, the question is whether, at the moment an overlap would begin, there is room as defined for her to pass between them. ‘The test to determine whether a boat establishing an inside overlap at a continuing obstruction is entitled to room requires the position of the outside boat to be frozen1
.’Could the boat astern sail through the gap between the boat ahead and the continuing obstruction – at that point?
If the gap is wide enough, the keep-clear boat astern is entitled to become overlapped inside the boat ahead. If they are on the same tack, a leeward overlap from astern will now require the windward boat to keep clear under rule 11 as well as giving room under rule 19.2(b), but the leeward boat will be limited to a proper course by rule 17. If that is not relevant, the inside right-of- way boat can drive the outside boat further from the obstruction. If the inside overlap from astern is to windward of the outside boat, the outside boat’s only obligation is to give room under rule 19.2(b), and the outside boat can therefore shepherd the inside boat along the obstruction even if her next objective is somewhere to leeward of that course. This will be so when the boats are on the same tack, or the when a port-tack boat astern becomes overlapped between a starboard tack boat and the continuing obstruction.
These obligations will continue while the boats continue to pass the obstruction without gybing, with the inside boat being allowed more
Room at a Continuing Obstruction
No room to pass between, so no room entitlement for the boat astern, which must keep clear in any inside overlap.
Green is entitled to room from Blue, but no more, while they are overlapped at the continuing obstruction. Green must keep clear.
Room to pass between, so the keep-clear boat astern is entitled to room when overlapped.
Green is not a keep-clear boat, so not rule 19.2(c), Red must keep clear under rule 10.
Yellow must not only give room to Red but also keep clear. Red can luff only if she has a proper course on the other bank.
room only when there are projections from the obstruction, such as a jetty or a shallow patch2 may change rights, and any same-tack rule 17 limitation will end.
. If either gybes, this
If the gap is not wide enough, the act of the boat astern becoming overlapped inside the boat ahead turns her (the inside boat) into a keep-clear boat with no entitlement to room from the boat that was ahead, which retains her right-of-way status, even if she is now a windward boat, since rule 11 is disapplied. The outside boat can close the gap, whether by luffing or bearing away, limited only by the risk of damage or injury resulting from any collision, and the inside boat would be advised to fall astern, so that the break of overlap would reset the situation to what it had been before the unsuccessful intervention. This is the only situation under Section C where a Section A right of way is explicitly overridden.
1 RYA 2014/4 2 RYA 1968/11
RYA The Racing Rules Explained 97
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