Patent ID: 7130740

Claim:
A method of generating a symbolic description of a navigational element, the method comprising the steps of: a. providing a radial grid, the radial grid comprising at least one group of subdivisions, the at least one group of subdivisions comprising a set of partitions extending outward from a center of the radial grid; b. providing a plurality of geographic coordinates; c. transforming the plurality of geographic coordinates to a plurality of planar coordinates; d. mapping the plurality of planar coordinates with the radial grid; e. allocating the plurality of planar coordinates to the at least one group of subdivisions; f. selecting at least one subdivision from the at least one group of subdivisions as an entry; g. selecting at least one subdivision from the at least one group of subdivisions as an exit; and h. generating the symbolic description of the navigational element based upon the entry and the exit.