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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 minimum visible distance requirements of navigational lights are detailed under this rule. [30] These vary according to the length of the vessel. [ 30 ] For example, for vessels greater than 50 metres in length, the visibility ranges of lights are 6 miles for masthead lights, 3 miles for sidelights, 3 miles for the sternlight, 3 miles for ...
Aviation obstruction lighting is used to enhance the visibility of structures or fixed obstacles which may conflict with the safe navigation of aircraft. Obstruction lighting is commonly installed on towers, buildings, and even fences located in areas where aircraft may be operating at low altitudes.
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 ...
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SS Potomac (T-AOT-181), note the green Single-Anchor Leg Mooring (SALM) on the center deck for use for deploying the OPDS hoses, hose reels are forward Potomac (T-AO-150) was a Maumee -class ship that suffered a catastrophic fire in 1961 which however left her after section and machinery largely undamaged; this portion was purchased by Keystone ...
When the anchor is secured aboard the ship for sea; i.e. when it is not deployed. Typically rests just outside the hawsepipe on the outer side of the hull, at the bow of a vessel. anchor light A white light displayed by a ship to indicate that it is at anchor. Two such lights are displayed by a ship over 150 feet (46 m) in length. [3] anchor rode