1. A system for enhancing the visibility and ensuring the correctness of terrain information on a visual display, comprising: a data storage unit, said data storage unit operable to store a set of terrain data; a position data source, said position data source operable to determine at least one of a current position, heading and speed of an aircraft, and produce a set of spatial position data; and a processing unit coupled to said data storage unit and said position data source, said processing unit operable to: receive at least one of said current position, heading and speed and an attitude of said aircraft; load a patch of terrain data, said patch of terrain data associated with said at least one of said current position, heading and speed and an attitude of said aircraft, and said patch of terrain data formed as a subset of said set of terrain data; compare said patch of terrain data with said set of spatial position data; and if an accuracy value associated with said set of spatial position data is greater than an accuracy value associated with said patch of terrain data, augment said patch of terrain data with said set of spatial position data.