My first sonar device and my first boat. Took the Lowrance to the lake for the first time to see what I could do to find some fish and fishing spots. Not sure if I ever marked any fish at all. We had luck fishing but not because of the FF. I think I was getting a lot of clutter. The transponder is mounted on the transom according to directions(I think). I kept getting returns that looked like dark rays from bottom to top at a 20 to 30 degree angle down. When I played with settings such as sensitivity, all I got was depth. Must be a sweet spot in there somewhere. I did not expect to master it on the first trip either. The water we were in was fairly shallow, 17' at the deepest, and colored to where you could not see bottom in 2 feet of water. I am sure all this played into my issues. Those dark rays from top to bottom is what had me cornfused! Thanks for any and all help.