Patent ID: 8160757

Claim:
A method for providing optimum multi-map overlay in a system of an aircraft, comprising: outputting absolute terrain data via a first module of the system to a navigation display of the system for display by the navigation display; receiving a threshold elevation input, the threshold elevation input including a threshold elevation, said threshold elevation being a threshold distance above terrain for the aircraft; when the aircraft is located below the threshold elevation, outputting relative terrain data via a second module of the system, the second module being communicatively coupled with the first module; and when the aircraft is located below the threshold elevation, overlaying the relative terrain data onto the absolute terrain data based on the received threshold elevation input, the absolute terrain data and the relative terrain data being concurrently displayed by the navigation display when the aircraft is located below the threshold elevation, the displayed relative terrain data being overlaid onto the displayed absolute terrain data, wherein the overlaid relative terrain data is removed and only the absolute terrain data is displayed via the navigation display when the aircraft has changed its current location from being located below the threshold elevation to being located above the threshold elevation, wherein the first module scans the relative terrain data which is output by the second module and determines positions of hazards based on the relative terrain data.