Patent ID: 8538676

Claim:
A mobile geographic information system comprising: a database containing geographic information including information related to at least one geographic feature and information relating to at least a first waypoint associated with the at least one geographic feature for traveling from a user position to a predetermined geographic location; a mobile device for communicating with the database; a controller integrated with the mobile device for communicating through the mobile device with the database and a position sensor for determining the user position associated with the mobile device, with the controller receiving information from the position sensor to indicate the user position and the controller determining a first circularly spatially extended point (CSEP) about the user position, the controller further determining a second CSEP about the at least first waypoint with a two dimensional size of the second CSEP being determined based on whether the at least first waypoint is fixed or mobile and the instructing a user as to a qualitative relative position of the mobile device and the at least one geographic feature in response to a predetermined topological relationship between the first CSEP about the user position and the second CSEP about the at least first waypoint to provide refined instructions for the user to proceed to the predetermined geographic location, with the qualitative relative position between the user position (A) and the at least first waypoint (B) being determined in response to a topological relationship selected from the group consisting of at least four (4) of the following topological relationships: a disjointing of A and B, a meeting of A and B, an overlap of A and B, a covering by A of B, a covering by B of A, a containment by A of B, a containment by B of A, or an equality between A and B, and changing the refined instructions with a changing of the qualitative relative position between the user position (A) and the first waypoint (B).