The higher the pixel count, the better the resolution. Since Lowrance makes Eagle, I suspect the 480 and 125 are the same. Both have 480 X 480 pixels count which is higher than the 500C. I have a X125 on my bow and its pretty good. I've been trying to make up my mind to put a 102C there. ITs the same as the X125 except color and $200. The color ones sure look nice tho.