Mark Room Rules for the Offset MarkThe offset mark can be a confusing place for the rules. Lots of things tend to be happening very fast – we’re bearing off, getting ready to hoist, and the rules situation is sometimes murky.
Does the offset mark count as a mark? Do the two marks count as some sort of long continuous mark? If I get room at the weather mark does that automatically mean I get room at the offset mark?
Let’s see:
In the racing rules of sailing, the definition of
mark is:
An object the sailing instructions require a boat to leave on a specified side.So is the offset mark mentioned in the SIs? Yes
Are we required to leave it on a specified side? Yes
So is it a mark? YES!
Since it’s a mark, Rule 18 applies just like at any other mark.
Is the offset mark its own mark, or does it just count as an “extension” to the regular weather mark?
Nothing in the rule book says anything about an offset mark being a special kind of continuous mark, so NO, it counts as a totally separate mark.
The key concept is that Mark Room is determined separately for each mark. Mark room is determined at the snapshot in time when the first boat reaches the zone for that mark. In this case, we look at whether there’s an overlap at each mark’s zone independently – both the zone around the weather mark, and the separate zone around the offset mark.
Here’s some scenarios to help clarify:
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