Abstract: Systems and methods for generating an optimized terrain database identify several regions, including test regions that are established from the identified regions. A first set of terrain data is received for a first test region. The first set of terrain data is compared to a second set of terrain data to determine a set of quality attributes. The quality attributes are used to determine a safety margin for the first test region. The safety margin is applied to other regions having the same or similar characteristics to the first test region. Safety margins are either generated for or applied to all other regions. All regions are then compiled into an area-wide terrain database, up to and including a worldwide database.

Abstract: Embodiments of the present invention generally relate to systems and methods for identifying and eliminating discrepancies in electronic maps. Embodiments of a method and system for correcting discrepancies in an electronic map includes receiving location information from one or more computing devices using the electronic map, identifying a discrepancy between the electronic map and the location information, and altering the electronic map to eliminate the discrepancy.

Abstract: The present invention provides a method of communicating information between a navigational computer and a user by the input and output devices associated with the navigational computer to determine a navigational parameter. The method includes the step of using the input device to select a navigational parameter whose value is to be determined by the navigational calculator. The preferred method includes the step of using the output device to display all of the variables required to calculate the selected navigational parameter. Also included in the method of the present invention is the step of using the input device to define the values associated with the variables necessary to calculate the selected navigational parameter in any order that is convenient to the user. Moreover, the user can change the value associated with a variable until the desired value is attained without having to redefine the values associated with other variables.