I'm not 100% sure what the difference between the two models are, but I do have a marcum VS825SD camera I'm looking to sell if you're interested. It is the higher end model that gives water temperature, depth, and direction the camera is pointed in relation to the screen. It has the camera panner as well. I bought it two years ago and it works perfectly. I paid about $900 end of season two years ago. So it was really only used for one season. If you're interested, let me know!