1. A method of co-ordinate registration for an Over-the-Horizon Radar comprising the steps of: generating a geographic auto-correlation function to determine at least one geographic beacon in a coverage area of the Over-the-Horizon Radar; analyzing and comparing a return radar signal with a geographic map of the coverage area in the general region of the at least one geographic beacon; and finding a best fit of the geographic map with the radar return signal to enable registration of co-ordinates of the return radar signal.