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navigational grid
(DOD, NATO) A series of straight lines, superimposed over a conformal projection and indicating grid north, used as an aid to navigation. The interval of the grid lines is generally a multiple of 60 or 100 nautical miles. See also military grid.
Source: US DoD Joint Publication 1-02, DOD Dictionary of Military and Associated Terms (as amended through 9 June 2004).
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