Patent ID: 8249806

Claim:
A system for varying the display of at least one visual aid depicted on an aircraft display unit, said system comprising: a data source for providing navigation data; a data source for providing navigation reference data; an image generating processor, wherein such processor receives navigation data representative of aircraft position, receives navigation reference data representative of at least one visible feature which corresponds to the aircraft position, generates visual aid data representative of at least one variable-intensity visual aid, where each visual aid is representative of a visible feature located in the scene outside of the aircraft, and the intensity of each visual aid varies, where such variation is based upon at least one quality parameter of the navigation data, navigation reference data, or both, and provides the visual aid data to an aircraft display system; and the aircraft display system, whereby the varying intensity of each visual aid depicts a fading-in effect of the visual aid in the direction of the horizon on at least one display unit.