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Sir Ralph
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Long live teh Schwampel!
Dec 2001 time: 06:25
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It depends on a couple of factors, if a map can be a military secret or not, not only on the scale. First off, many "free" maps are distorted. You won't notice this if you drive or walk by this map, but if you measure distances or angles across the map, you will. Second, many "free" maps are based on another reference ellipsoid. So for instance, free maps in Germany are based on the ellipsoid of Bessel, while military maps are based on the Hayford spheroid. This also results in minimal distortions, which render a map unusable for the calculation of artillery or missile strikes. Third, on "free" maps usually aren't printed the military rectangular grids. Longitude and Latitude are not of a big use, if you want to make precise calculations.
In many countries precise maps are considered a secret. Usually these countries provide two different sets of maps, those for civil use, on another ellipsiod, without the military grids and not providing a set of corrections, and military maps with all this additional data.
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