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System for recalculating a path
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Method for storing map data in a database using space filling curves and a method of searching the database to find objects in a given area and to find objects nearest to a location
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Using multiple levels of costs for a pathfinding computation
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Method for determining exits and entrances for a region in a network
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Navigation system using GPS data
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Cost zones
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Method of clustering multi-dimensional related data in a computer database by combining the two verticles of a graph connected by an edge having the highest score
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Automatic chain-based conflation of digital maps
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Combined relative and absolute positioning method and apparatus
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Apparatus and method for displaying a map
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Method and device for measuring relative directional change in vehicle-mounted cruising system
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Two-axis differential capacitance inclinometer
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Two-axis angular rate gyroscope
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Graphic expression storage for topology structure
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Method and apparatus for measuring relative heading changes in a vehicular onboard navigation system
