Importance

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Abstract

Methods and apparatus are provided for referencing a map to the coordinate space of a positioning system, such as a GPS system. For each of a number of real-world positions (X1, X2, X3), the location (L.sub.P1, L.sub.P2, L.sub.P3) of the real-world position in a coordinate space of the map, is associated with a location(L.sub.G1, L.sub.G2, L.sub.G3) in the coordinate space of the positioning system determined by taking at least one positioning-system reading at the real-world position (X1, X2, X3). Using these associated locations, a master transform is determined for converting relative location information between the coordinate spaces. The relative location information is information that serves to specify a location relative to the already-known locations and can take the form of displacement vector information.

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First Claim