US Patent 8457882 Systems and methods for navigation in a GPS-denied environment

Systems and methods for updating a navigation system are provided. In one implementation, a system includes: a navigation system configured to provide a navigational solution; at least one memory device configured to store a terrain object database, the terrain object database storing information that describes a terrain; a user interface configured to display a terrain model and receive position adjustments from a user; and a processing unit configured to generate displayable information for displaying the terrain model using the information stored on the at least one memory device and the navigational solution, and calculate corrections to the navigational solution from the position adjustments and transmit the corrections to the navigation system.