Raymarine Raytheon Raychart RC320 320 GPS Navigator Chartplotter Radar E32015For spare parts or repair only. You will receive what you can see in the photos. The Raytheon RC320, also known as the Raychart 320, is a GPS chartplotter designed for marine navigation. It features a 4. 74 inch display with large digital readouts and utilizes C MAP NT micro cartridges for detailed chart plotting. Equipped with a 12 parallel channel GPS receiver, the RC320 is capable of receiving augmented Wide Area Augmentation System (WAAS)