Marine Navigational Lights

Importance of navigation lights in shipping

Navigational Lights are used to prevent collisions at nights or in the times of reduced visibility, and are an essential tool in keeping you and vessel safe. Navigation light allow you to see other nearby vessels and allow vessels to see you. These helps us to determine weather own vessel is stand-on or give-way vessel. These Lights shall be displayed between sunset and sunrise and during period of restricted visibility like in fog. The significance of navigation lights is different vessels have different types of lights exhibited on fore and aft side of the vessel e.g. ships at anchor, Not under command ,restricted in her ability to maneuver and constrained by her draft vessels.

Role of Navigational Lights in collision avoidance

The international regulation for preventing collisions at sea ,1972 had established requirements for navigation lights to be displayed by all vessels. To avoid collisions, vessels show navigation lights on fore and aft mast head part on vessel, so that other vessels can take bearing and decide for risk of collision, exists or not! A power-driven vessel display a mast head light over an arc of horizon of 225 degrees from right ahead to 22.5 degrees abaft of her beam and also including sidelight from right ahead to 22.5 degrees abaft of her beam on both side of vessel for 112.5 degrees and also including the stern light from right stern to 22.5 degrees abaft of beam of vessel
Over an arc of horizon of 135 degrees. Pleasure craft operators must make that their boats are equipped with the systematic navigation lights and use the lights during these conditions: When away from the dock between sunset and sunrise. During the times of restricted visibility such as fog or heavy rain.

Regulations concerning Navigational Lights

A mast head lights, sidelights and a stern light installed on board a ship not less than 50m in length should be duplicate or be fitted with duplicate lamps specified by manufacturer. A sufficient number of spare lamps for Navigation lights should be carried on board ships. Within the prescribed sector in which the minimum luminous intensity is required luminous intensity is required the vertical intensity distribuation of the lights should be uniform in such a way that the measured minimum and maximum luminous intensity values do not differ by more a factor of 1.5. An alarm must notify the officer on watch that the luminous intensity of the light reduces below the level required by rules of road. The lifespan of light emmited diode should be found and clearly notified by the manufacturer. The international regulation for prevention of collisions at sea apply to all vessels upon seas and all vessels navigating in inland waterways, rivers, harbors and lakes.
According to rules 3 says a word include every vessel which capable of being transportation on water and include non-displacement, wig craft.
According to rule 20 all vessels shall show navigational lights from sunset to sunrise on the position where it can be seen clearly

According to Rule 21 Defines the different navigation lights.

Different colours used in navigational lights

Colored lights are always sidelights and different color shows the side. Red lights are fitted portside, and green are starboard. The lights shine from dead ahead to 112.5º aft on either side of the vessel. Sidelights: These red and green lights are called sidelights because they are visible to another vessel approaching from the side or head-on (also known combination lights). The red light indicates a vessel’s port left side; the green indicates a vessel’s starboard right side. Navigation lights are used to prevent collisions at night or in times of decreased visibility, and are an essential tool in keeping you and your vessel safe. Navigation lights allow you to see other nearby vessels, and allow others similar vessels to see you.

Marine Navigational Lights
(Source- Sea Magazine)

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