The one to keep clear of those having the right of way.
The vessel without right-of-way that must keep clear of a vessel that does have the right of way
That vessel which, according to the applicable Navigation Rules, must give way to the privaleged vessel. The term has been superseded by the term "give-way"
The boat which, in a collision situation, did not have the right-of-way. See PRIVILEGED VESSEL.