The 4000 and 5000 screens only display the exact pixel count of your source device. Meaning if you attach a camera that has 320 x 160 lines of resolution, it will only show that size picture on the screen, thus a small video with lots of black all the way around. The 6000 and 7000 screens will automatically scale the picture to fill the entire screen. There are external scalers available, mainly for the home residential market, but they are a little pricey and not built for applications that can get wet. Maybe someone has a cheap solution they found.
2008 Fountain 38' LX with Triple Verado 300s