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COLREGs Part D: Sound and Light Signals — The Language of Warning at Sea

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  Understanding Rules 32–37 for Safe Communication Between Vessels When visibility becomes poor, ships cannot depend entirely on visual observation. Fog, heavy rain, darkness and other conditions can make it difficult to identify another vessel or determine its intentions. In these situations, sound and light signals become an essential part of communication at sea . Part D of COLREGs covers Rules 32–37 , dealing with sound and light signals. The six rules cover the definitions of whistle signals, sound-signalling equipment, manoeuvring and warning signals, restricted-visibility signals, attention signals and distress signals. For a seafarer, learning Part D is not simply about memorising patterns of short and prolonged blasts. The real objective is to understand what a signal means, when it should be used, how it should be interpreted and how it fits into the overall navigational situation . Rule 32 — Definitions Before understanding the individual signals, COLREGs first est...
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COLREGs Part C: Lights and Shapes — Understanding the Visual Language of Ships at Sea

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  Rules 20–31 | The lights and shapes every seafarer must recognise At sea, navigation does not stop when daylight disappears. In darkness, restricted visibility and busy traffic conditions, a vessel communicates important information through navigation lights and day shapes . These visual signals help other vessels understand what type of vessel they are observing, whether it is underway, anchored, towing, fishing, restricted in its ability to manoeuvre or constrained by draught. This is the purpose of Part C of the International Regulations for Preventing Collisions at Sea (COLREGs) . Part C contains Rules 20–31 , covering lights and shapes. The International Maritime Organization (IMO) identifies Part C as the section dealing with lights and shapes, supported by technical requirements in Annex I. For a deck officer keeping a night watch, recognising a vessel's lights is not simply a matter of memorising colours. The colour, position, number, arrangement, relative bearing and ...
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COLREGs Part B: Steering and Sailing

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  The Rules That Guide Ships Away From Collision The International Regulations for Preventing Collisions at Sea (COLREGs) provide the international framework for preventing collisions between vessels. Part B — Steering and Sailing is at the heart of this framework, covering Rules 4–19 . It explains how vessels should conduct themselves in different visibility conditions, when vessels are in sight of one another, and when visibility is restricted. For a deck officer, Part B is not simply a collection of rules to memorize. It provides a structured way to observe traffic, assess collision risk, determine responsibilities, and take appropriate action. CONDUCT IN ANY CONDITION OF VISIBILITY Rules 4–10: The Foundation of Collision Avoidance The first section of Part B contains Rules 4–10 and applies in any condition of visibility . These rules establish fundamental principles that every vessel must follow regardless of whether navigation takes place in clear weather, darkness, rain,...
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COLREGs – Section A: The Foundation of Safe Navigation

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  Rules 1–3 Every Seafarer Should Understand The International Regulations for Preventing Collisions at Sea (COLREGs) provide the fundamental rules that govern how vessels navigate in relation to one another. Before learning who should give way, which vessel should keep course and speed, or what lights and shapes must be displayed, seafarers must first understand Part A – General . Part A contains Rules 1, 2 and 3 . These three rules establish the scope of the regulations, the responsibility of the master and crew, and the important definitions used throughout COLREGs. Although these rules appear simple, they form the foundation for correctly interpreting the rest of the regulations. RULE 1 — APPLICATION Rule 1 explains where and to whom the COLREGs apply . The regulations apply to vessels on the high seas and in waters connected with the high seas that are navigable by seagoing vessels. This is important because COLREGs are intended to provide a consistent set of collision-pr...
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