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Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
The appropriate lights may also be displayed during the day at times of restricted visibility or other necessary circumstances. [3] Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night. [4] A square black flag displayed over the ball may be used as a distress signal. [5]
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.
Class A - the boat may safely navigate any waters. Class B - the boat is limited to offshore navigation. (Winds up to Force 8 & waves up to 4 metres) Class C - the boat is limited to inshore (coastal) navigation. (Winds up to Force 6 & waves up to 2 metres) Class D - the boat is limited to rivers, canals and small lakes.
Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist ...
Rotating-style blue sign laying flat when not active. There is a 5 cm white border and the light is in the centre. A blue sign or blue board is used by inland waterways vessels within the Trans-European Inland Waterway network when performing a special manoeuvre or passing on the starboard side.