Bought a like-new fishfinder from a buddy for $25, its a Hummingbird LCR 400 ID portable. I mounted the tranducer (exactly as instructed in the manual) on the back lower left on the transom, drilled in 2 cable clips to keep it against the transom, drilled a small hole at the top of the transom to bring the cable into the boat, sealed all with silicone-ready to go! I took it out on the water, it works perfect- love it!, but I seem lost on what settings to use, how far ahead am I seeing under my boat compared to whats on my screen? Why when both anchors are down does the structure still move across the screen even when display speed is on slowest and I'm not moving? Any advice on settings, alarms, sensitvity, ect... would help this newbie alot! This is my first boat , first fishfinder. Thank fellas! D. 8-)