I have a furuno 1933 and i recently installed it into my boat, the gps and the radar works. The problem im having is that my radar is reading mirror image, i reset my heading which is correct but everything on my port side is showing to my right on my radar screen. And everything on the starbard side is reading to my left on the screen. The screen is an rdp 139 and the radar is a rsb-0070.