JP 1-02, DOD Dictionary of Military and Associated Terms - DMRTI ...

As Amended Through 15 March 2012US Government (civil service) employees. These ships are designated United StatesNaval Ships and use the prefix “USNS” with the ship name and the letter “T” as aprefix to the ship classification (e.g., T-AKR). See also Military Sealift Command;United States Naval Ship. (JP 3-02.2)gradient — The rate of inclination to horizontal expressed as a ratio, such as 1:25,indicating a one unit rise to 25 units of horizontal distance. (JP 4-01.6)grand strategy — See National Security Strategy.grid — 1. Two sets of parallel lines intersecting at right angles and forming squares; the gridis superimposed on maps, charts, and other similar representations of the Earth’ssurface in an accurate and consistent manner in order to permit identification of groundlocations with respect to other locations and the computation of direction and distanceto other points. 2. A term used in giving the location of a geographic point by gridcoordinates. (JP 2-03)grid bearing — Bearing measured from grid north.grid convergence — The horizontal angle at a place between true north and grid north. It isproportional to the longitude difference between the place and the central meridian.See also convergence.grid convergence factor — (*) The ratio of the grid convergence angle to the longitudedifference. In the Lambert Conical Orthomorphic projection, this ratio is constant forall charts based on the same two standard parallels. See also convergence; gridconvergence.grid coordinates — Coordinates of a grid coordinate system to which numbers and lettersare assigned for use in designating a point on a gridded map, photograph, or chart. Seealso coordinates. (JP 3-09)grid coordinate system — (*) A plane-rectangular coordinate system usually based on,and mathematically adjusted to, a map projection in order that geographic positions(latitudes and longitudes) may be readily transformed into plane coordinates and thecomputations relating to them may be made by the ordinary method of plane surveying.See also coordinates.ground alert — (*) That status in which aircraft on the ground/deck are fully serviced andarmed, with combat crews in readiness to take off within a specified short period oftime (usually 15 minutes) after receipt of a mission order. See also airborne alert.ground control — (*) A system of accurate measurements used to determine the distancesand directions or differences in elevation between points on the Earth. See also controlpoint.140 JP 1-02