| http://www.w3.org/ns/prov#value | - Fukushima in U.S. Pat. No. 5,293,318, discloses a navigation system including a global positioning system (GPS) receiver and a self-operating sensor for determining the position of a reception point or a mobile object such as an automobile in a global geometrical region with the increased accuracy when the PDOP value cannot be determined with an adequate degree of precision.
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