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  2. Military Grid Reference System - Wikipedia

    en.wikipedia.org/wiki/Military_Grid_Reference_System

    1234 5678 (numerical location; easting is 1234 and northing is 5678, in this case specifying a location with 10 m resolution) An MGRS grid reference is a point reference system. When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the ...

  3. German Naval Grid System - Wikipedia

    en.wikipedia.org/wiki/German_Naval_Grid_System

    German Naval Grid Reference (German:Gradnetzmeldeverfahren), was a system for referencing a location on a map. Introduced initially by the German Luftwaffe just before World War II , it was used widely in the German armed forces until 1943.

  4. Marsden square - Wikipedia

    en.wikipedia.org/wiki/Marsden_square

    A Marsden Square map. Marsden square mapping or Marsden squares is a system that divides a world map with latitude-longitude gridlines (e.g. plate carrée projection, Mercator or other) between 80°N and 70°S latitudes (or 90°N and 80°S) into grid cells of 10° latitude by 10° longitude, each with a geocode, a unique numeric identifier.

  5. Duga radar - Wikipedia

    en.wikipedia.org/wiki/Duga_radar

    Chernobyl-2. Secret Military Facility in the territory of exclusion zone. Text and photos Archived 28 August 2009 at the Wayback Machine 2008; OTH-Radar "Chornobyl - 2" and Center of space-communication "Circle" is an auxiliary system for OTH-Radar "Chornobyl - 2" The Russian Woodpecker, Miami Herald, July 1982. Steel Yard OTH, globalsecurity.org

  6. World Geographic Reference System - Wikipedia

    en.wikipedia.org/wiki/World_geographic_reference...

    The GJ local grid. For example, on a GEOREF chart, Naval Air Station Patuxent River (38°17′10″N 76°24′42″W) / (38.286108, -76.4291704) is located (to the nearest minute) at position GJPJ3417. To locate the position from the coordinates, proceed as follows: Right from 180° longitude to longitude zone G

  7. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/.../1951_USAF_resolution_test_chart

    A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.

  8. Alphanumeric grid - Wikipedia

    en.wikipedia.org/wiki/Alphanumeric_grid

    An alphanumeric grid (also known as atlas grid [1]) is a simple coordinate system on a grid in which each cell is identified by a combination of a letter and a number. [2]An advantage over numeric coordinates such as easting and northing, which use two numbers instead of a number and a letter to refer to a grid cell, is that there can be no confusion over which coordinate refers to which ...

  9. World Meteorological Organization squares - Wikipedia

    en.wikipedia.org/wiki/World_Meteorological...

    World Meteorological Organization (WMO) squares is a system of geocodes that divides a world map with latitude-longitude gridlines into grid cells of 10° latitude by 10° longitude, each with a unique, 4-digit numeric identifier.