A map projection consisting of a set of overlays, used with radar displays, to compensate for the possibility of second-trip echoes. The overlays, shifted in range by multiples of the maximum unambiguous range, make it possible to determine where range-aliased echoes are in relation to cities, political boundaries, or other features commonly plotted on radar displays. If radar echoes are automatically dealiased, the Rinehart projection need not be used.