Rule 18.1, Rounding and Passing Marks and Obstructions: When This Rule Applies
Discussion of the phrase ‘about to round or pass’.
Question
When is a boat ‘about to round or pass’ a mark within the meaning
of rule 18.1?
Answer
The phrase ‘about to round or pass’ has never been defined
precisely, nor can it be. In approaching a mark, there is no exact point at
which a boat becomes ‘about to round or pass’ it. Almost
always, a boat two hull lengths from a mark is ‘about to round or pass’
it, but this is sometimes so at a greater distance too. Not only is the distance
from the mark a factor, but the boat's speed is also important, and other factors
such as the conditions of wind and current and the amount of sail handling required
before or during the rounding may also be relevant. Moreover, the nearer the
boat is to the mark the more definitely she is about ‘about to round or
pass’ it. The answer to the question depends upon the particular circumstances
of each situation.
The phrase ‘about to round or pass’ has never been defined precisely, nor can it be. In approaching a mark, there is no exact point at which a boat becomes ‘about to round or pass’ it. Almost always, a boat two hull lengths from a mark is ‘about to round or pass’ it, but this is sometimes so at a greater distance too. Not only is the distance from the mark a factor, but the boat’s speed is also important, and other factors such as the conditions of wind and current and the amount of sail handling required before or during the rounding may also be relevant. Moreover, the nearer the boat is to the mark the more definitely she is ‘about to round or pass’ it. The answer to the question depends upon the particular circumstances of each situation.
USSA 1953/53