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The International Regulations for Preventing Collisions at Sea 1972, also known as Collision Regulations (COLREGs), are published by the International Maritime Organization (IMO) and set out, among other things, the "rules of the road" or navigation rules to be followed by ships and other vessels at sea to prevent collisions between two or more vessels.
Diagram showing principle of constant bearing, decreasing range in marine collision avoidance. When an observer sees another vessel at a constant bearing and the range continually decreases, collision is imminent. A ship seen to be on a constant bearing with decreasing range will collide with the observer's ship unless avoiding action is taken.
A typical shipboard ARPA/radar system. A marine radar with automatic radar plotting aid (ARPA) capability can create tracks using radar contacts. [1] [2] The system can calculate the tracked object's course, speed and closest point of approach [3] (CPA), thereby knowing if there is a danger of collision with the other ship or landmass.
BEIJING/MANILA (Reuters) -China and the Philippines traded accusations over a collision in disputed waters of the South China Sea as Chinese vessels blocked Philippine boats supplying forces there ...
March 5: Chinese and Philippine coast guard vessels are involved in a minor collision off the Second Thomas Shoal, and four Filipino crew members are injured when China blasts a supply boat with ...
Philippine officials in Manila said it was their coast. China and the Philippines accused each other of causing a collision between their two vessels Saturday in the latest flareup of tensions ...
The original purpose of AIS was solely collision avoidance but many other applications have since developed and continue to be developed. AIS is currently used for: Collision avoidance AIS was developed by the IMO technical committees as a technology to avoid collisions among large vessels at sea that are not within range of shore-based systems.
Radar is a vital navigation component for safety at sea and near the shore. It allows a 'lookout' to be maintained, being one of the approved available means for compliance with Rule 5, keeping a proper lookout under the International Regulations for Preventing Collisions at Sea . [ 2 ]