Types of grids military10/2/2023 Normally, it would seem logical to assign a value of zero to the two base lines and measure outward from them. With each grid line assigned a value denoting its distance from the origin, the problem of locating any point becomes progressively easier. Base values (in meters) are assigned to the central meridian and the equator, and the grid lines are drawn at regular intervals parallel to these two base lines. (1) Each of the 60 zones (6 degrees wide) into which the globe is divided for the grid has its own origin at the intersection of its central meridian and the equator ( Figure 4-8). The UTM grid has been designed to cover that part of the world between latitude 84° N and latitude 80° S, and, as its name implies, is imposed on the transverse Mercator projection. The dimensions and orientation of different types of grids vary, but three properties are common to all military grid systems: one, they are true rectangular grids two, they are superimposed on the geographic projection and three, they permit linear and angular measurements.Ī. This grid (a series of straight lines intersecting at right angles) furnishes the map reader with a system of squares similar to the block system of most city streets. To aid these essential operations, a rectangular grid is superimposed upon the projection. The quadrangles formed by the intersection of these curved parallels and meridians are of different sizes and shapes, complicating the location of points and the measurement of directions. Precision lightweight global positioning system receiverĪn examination of the transverse Mercator projection, which is used for large-scale military maps, shows that most lines of latitude and longitude are curved lines. Navigation in different types of terrainĬ. Protection of map coordinates and locationsġ3. Locate a point using the us army military grid reference system United states army military grid reference system SurvivalIQ Handbook: Land Navigation - Grids - Military grids
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