(Generally, the use of maps is mainly to detect the route, GPS positioning, and the path to find the destination. Especially in the use of mobile maps, the accurate positioning of maps is very important. However, it is difficult for online maps to make road traffic maps and satellite road comprehensive maps fit each other, that is, there is an offset error between the two, which presents an error in the use of GPS positioning, and online maps generally cannot solve the problem of offset.)
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