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Geodetic System Geodesy Geodetic systems or map datums are used in geodesy, navigation, surveying and the Global Positioning System to indicate the datum or reference point to which a measured position is relative. The systems are needed because the earth is not a perfect sphere. Examples of map datums are: The main reason that there are a number of datums is that national map making organisations did not have a common surveying reference point and only produced maps for their locality.
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