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GPS accuracy varies based on several parameters, most important the number of satellites you can get signals from, and their geometric distribution on the sky. Some factors affecting this are: Line-of-sight. You need line-of-sight to the satellites to get any useable signals. Different locations will have different horizons (i.e. a hill, mountain or ...


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The other excellent answers here are primarily about latitude. A degree of longitude shrinks from about 111 km at the equator to 0 at the poles, so the precision of a decimal degree of longitude shrinks as you get closer to the poles (I am making no comment on accuracy!) As an approximation, the length in km of one degree of longitude is cos(latitude in DD ...


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