FSX/P3D. The GNS 430 and GNS 530 series gauges have lead the industry with multitasking, integrated avionics and cutting edge WAAS navigation for many years. A single GNS 430 or GNS 530 functions as a communications radio (COMM), a VOR/ILS/GS receiver (NAV), and a moving map GPS. Combining one of each makes a common dual-GPS avionics suite for IFR-certified aircraft.
Note: The GNS 530 and GNS 430 gauges are each sold separately (make sure you make the right selection prior to purchasing). Purchasing one of each gauge allows you install up to two of the same gauge in the same aircraft. For example, there's no need to buy two GNS 530 gauges if you want two installed in your aircraft! Thanks to several readers for the tipoff!