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General Railway Signal Company (GRS) was an American manufacturing company located in the Rochester, New York area. GRS was focused on railway signaling equipment, systems and services.
Union Switch & Signal (commonly referred to as US&S) was an American company based in Pittsburgh, Pennsylvania, which focused on railway signaling equipment, systems and services.
An AEI tag attached to the side of a freight car. Automatic equipment identification (AEI) is an electronic recognition system in use with the North American railroad industry.
Academi, formerly known as Blackwater and Blackwater Worldwide, is an American private military contractor founded on December 26, 1997, [2] by former Navy SEAL officer Erik Prince.
The Gamma Ray Spectrometer weighs 30.5 kilograms (67 lb) and uses 32 watts of power. Along with its cooler, it measures 468 by 534 by 604 millimetres (18.4 by 21.0 by 23.8 in).
The Military Grid Reference System (MGRS) [1] is the geocoordinate standard used by NATO militaries for locating points on Earth. The MGRS is derived from the Universal Transverse Mercator (UTM) grid system and the Universal Polar Stereographic (UPS) grid system, but uses a different labeling convention.
The reference ellipsoid is usually defined by its semi-major axis (equatorial radius) and either its semi-minor axis (polar radius) , aspect ratio (/) or flattening, but GRS80 is an exception: four independent constants are required for a complete definition.
The Earth-centered, Earth-fixed coordinate system (acronym ECEF), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass.