Glossary Archive

Every vessel shall at all times maintain a proper look-out by sight and hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision. We can only hope to avoid something if we know it's...

Every vessel shall at all times proceed at a safe speed so that she can take proper and effective action to avoid collision and be stopped within a distance appropriate to the prevailing circumstances and conditions.  In determining a safe speed the following factors shall be among those taken into account: By all vessels: the...

Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of...

Any action taken to avoid collision shall be taken in accordance with the Rules of this Part and shall, if the circumstances of the case admit, be positive, made in ample time and with due regard to the observance of good seamanship. Any alteration of course and/or speed to avoid collision shall, if the circumstances...

A vessel proceeding along the course of a narrow channel or fairway shall keep as near to the outer limit of the channel or fairway which lies on her starboard side as is safe and practicable. A vessel of less than 20 metres in length or a sailing vessel shall not impede the passage of...

This Rule applies to traffic separation schemes adopted by the Organization and does not relieve any vessel of her obligation under any other Rule. A vessel using a traffic separation scheme shall: proceed in the appropriate traffic lane in the general direction of traffic flow for that lane; so far as practicable keep clear of...

Rules in this Section apply to vessels in sight of one another. This rule introduces the section and clarifies that everything in Part B—Section II is concerned with what happens when we are in sight of another vessel (specifically, what actions should be taken when we can see another vessel).

When two sailing vessels are approaching one another, so as to involve risk of collision, one of them shall keep out of the way of the other as follows: when each has the wind on a different side, the vessel which has the wind on the port side shall keep out of the way of...

Notwithstanding anything contained in the Rules of Part B, Sections I and II, any vessel overtaking any other shall keep out of the way of the vessel being overtaken. A vessel shall be deemed to be overtaking when coming up with another vessel from a direction more than 22.5 degrees abaft her beam, that is,...

When two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision each shall alter her course to starboard so that each shall pass on the port side of the other. Such a situation shall be deemed to exist when a vessel sees the other ahead or nearly...