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Barrier Boat (19BB) The 19 foot, 9.5 ton Barrier Boats (19BB) were built to deploy and maintain port security booms surrounding Navy ships and installations in port. A total 13 unnamed boats were first delivered in 2003. [107] Other Barrier Boats are 30-foot Modutech work boats. [108]
It could be used to find the altitude of the Sun or determine local time. It let sunlight shine through a small orifice on the rim of the instrument. The point of light striking the far side of the instrument gave the altitude or tell time. All those mentioned were the traditional instruments used until well into the second half of the 20th ...
The position of the lenses A and B are known, and the angle of the lenses α and/or β is set by the operator so that both are aimed at the target. Because the distance between A and B on a coincidence rangefinder is typically fixed, once the angle is set correctly the operator need only read the range from the scale.
Island-class patrol boat 30; Marine Protector-class coastal patrol boat 73; 47-foot Motor Lifeboat 117; Response boat-medium 48; USCG Utility Boat 156; USCG Long Range Interceptor 10; Defender class Response boat-small 300 [8] USCG transportable port security boat; Over the horizon boat; Short Range Prosecutor 10
A depression position finder measured the range to a distant target (such as a ship) by solving a right triangle in which the short side was the height of the instrument above mean low water; one angle was the constant right angle between the short side and the plane of the ocean, and the second angle was the depression angle from the horizontal of the instrument as it sighted down from a fire ...
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