Source: R R S

Continuing Obstruction

Updated: 2026-02-21

Definition

An obstruction is a continuing obstruction when the boat with the shortest hull referred to in the rule using the term will pass alongside it for at least three of her hull lengths. However, the following are not a continuing obstruction: a vessel under way, a boat racing, or a race committee vessel that is also a mark.

Definitions

Mark

An object the sailing instructions require a boat to leave on a specified side, a race committee vessel surrounded by navigable water from which the starting or finishing line extends, and an object intentionally attached to the object or vessel. However, an anchor line is not part of the mark.

Obstruction

An obstruction is

(a) an object that a boat could not pass without changing course substantially, if she were sailing directly towards it and one of her hull lengths from it;
(b) an object that can be safely passed on only one side; or
(c) an object, area or line that is so designated in a rule.

However, a boat racing is not an obstruction to other boats unless they are required to keep clear of her or, if rule 22 applies, avoid her.

Racing

A boat is racing from her preparatory signal until she finishes and clears the finishing line and marks or retires, or until the race committee signals a general recall, postponement or abandonment.