Hey Pete, welcome to the site and congrats on the new tool. Finish mounting that baby and get her on the water. The downward looking sonar (200khz and 83khz) is just like all other sonar units. The SI (455khz and 800khz) is your search tool. Until you get used to reading what you are looking at the best pictures in the SI mode will be while you are moving 3-5mph. Get yourself a good SD card and when you see something of interest, hit your right cursor key. This will freeze the screen. Move your cursor over the object and then press mark. This will save a waypoint of it for you. Now you can return to that spot and fish it or look for it with the downward looking sonar. Of course, that is just the quick startup explanation. Play with it and just learn to use it fit your fishing style. Good luck.