What is the meaning of grid convergence factor?

(DoD, NATO) The ratio of the grid convergence angle to the longitude difference. In the Lambert Conical Orthomorphic projection, this ratio is constant for all charts based on the same two standard parallels. See also convergence; grid convergence.
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APAMilitary Dictionary (DoD). (2011). grid convergence factor. Retrieved September 21, 2026, from http://smartdefine.org/grid_convergence_factor/definitions/1961925
ChicagoMilitary Dictionary (DoD). 2011. "grid convergence factor" http://smartdefine.org/grid_convergence_factor/definitions/1961925 (accessed September 21, 2026).
HarvardMilitary Dictionary (DoD) 2011, grid convergence factor, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/grid_convergence_factor/definitions/1961925>.
MLAMilitary Dictionary (DoD). "grid convergence factor" 4 April 2011. Web. 21 September 2026. <http://smartdefine.org/grid_convergence_factor/definitions/1961925>