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  2. Decca Navigator System - Wikipedia

    en.wikipedia.org/wiki/Decca_Navigator_System

    The Decca Navigator System consisted of individual groups of land-based radio transmitters organised into chains of three or four stations. Each chain consisted of a master station and three (occasionally two) secondary stations, termed Red, Green and Purple. Ideally, the secondaries would be positioned at the vertices of an equilateral ...

  3. Position resection and intersection - Wikipedia

    en.wikipedia.org/wiki/Position_resection_and...

    Position resection and intersection are methods for determining an unknown geographic position (position finding) by measuring angles with respect to known positions.In resection, the one point with unknown coordinates is occupied and sightings are taken to the known points; in intersection, the two points with known coordinates are occupied and sightings are taken to the unknown point.

  4. Geodetic control network - Wikipedia

    en.wikipedia.org/wiki/Geodetic_control_network

    A geodetic control network consists of stable, identifiable points with published datum values derived from observations that tie the points together. [ 1 ] Classically, a control is divided into horizontal (X-Y) and vertical (Z) controls (components of the control), however with the advent of satellite navigation systems, GPS in particular ...

  5. United States National Grid - Wikipedia

    en.wikipedia.org/wiki/United_States_National_Grid

    While latitude and longitude are well suited to describing locations over large areas of the Earth's surface, most practical land navigation situations occur within much smaller, local areas. As such, they are often better served by a local Cartesian coordinate system , in which the coordinates represent actual distance units on the ground ...

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  7. Military Grid Reference System - Wikipedia

    en.wikipedia.org/wiki/Military_Grid_Reference_System

    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 coordinates provided.

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