Image Number 7 for United States Patent #6415227.
An enhanced global positioning system and map navigation process, which incorporates the GPS position data and geospatial map data. This enhanced navigation process includes GPS-based efficient geospatial database access and query and a time-space filtering method to fully fuse the GPS position data and the geospatial map data to obtain enhanced navigation performance. The system features both portability and ease-of-use. It also accommodates mission specific database creation and value-adding techniques. The system includes personal navigation, land vehicle navigation, marine navigation, etc.