Abstract: A digital radar landmass simulator system for an aircraft flight simulator including a mapping radar portion using a computer to transfer pertinent blocks of terrain defining parameters stored in a high volume memory to a high speed memory and a processor accessing the high speed memory for collecting those parameters which correspond to each radar sweep line and for developing therefrom a mapping radar display driving signal and a terrain following radar portion having a profile line memory for storing those sweep line parameters which are collected by the mapping radar portion processor and which coincide with the azimuth angle of a simulated terrain following radar antenna, and a pair of processors for developing therefrom both a terrain following radar display driving signal and an autopilot driving climb/dive signal.