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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 ...
Air traffic control signal light gun in use at base flight tower. In the case of a radio failure or aircraft not equipped with a radio, or in the case of a deaf pilot, air traffic control may use a signal lamp (called a "signal light gun" or "light gun" by the FAA [1] [2]) to direct the aircraft.
Lateral force also induces heeling in a sailboat, which requires resistance by weight of ballast from the crew or the boat itself and by the shape of the boat, especially with a catamaran. As the boat points off the wind, lateral force and the forces required to resist it become less important. [6]
The US Air Force Eastern Test Range had operational control when the ships were at sea. [2] The larger C1-M-AV-1 type ships were redesignated by the Navy as AGM. [3] The original larger ORV were out of service on the Eastern Test Range by 1969. [1] The US Air Force still operates a small fleet of drone recovery vessels nicknamed the "Tyndall Navy".
AVR 661 is an R-1 type United States Air Force "crash boat", a boat used in air-sea rescues. [2] It is 85 feet long and has two Packard Marine 4M-2500 engines of 1500 horsepower, instead of the normal three that PT boats usually were equipped with.
Also colocated with the station is the oldest lighthouse on the Northwest Coast of the United States, Cape Disappointment Light, marking the north side of the Columbia River Bar. Less than two miles (3 km) to the northwest is North Head Light, which provides a beacon for the northern approaches to the Columbia River Bar.
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Two lights are positioned near one another. One, called the front light, is lower than the one behind, which is called the rear light. At night when viewed from a ship, the two lights only become aligned vertically when a vessel is positioned on the correct bearing. [3]