I have been having a lot of fun with my new to me (used) sonar-gps fish finder and thought I would share! First, knowing the thermo-cline level really helps, when on anchor fish show up in lines because they stay in the finder cone for a long time. The thermal-cline level is where the clutter stops! These pictures are on anchor in a strong wind so the finder shows weaving in all the pictures from the boat going up and down, from the fish to the bottom. fish throw off a color with these color fish finders because they are a harder surface for the pings to bounce off! the bottom can also be seen as hard or soft by how much color or what color is shown and how deep the soft mud goes! This is salmon and steelhead in a stillwater above Bonneville that I have been fishing. when trout fishing the color is much smaller in the fish but is still there so you can tell weeds and other clutter from fish! In these photo's notice the thermo clutter from hot water ends at 6 or 7 feet! notice where some of the fish are! My guess was that the salmon were deep and the lines up high are steelhead moving slower, the blobs on bottom (school of fish) must of been moving much faster! Also when using sonar it's the depth of the signal (how deep it is not how long) or color that shows how big the fish are. reason why I figure the deeper blobs are salmon, much thicker signals! What depth would you fish at? Steelhead (stillhead) and Chinook with indicators in stillwaters! TIGHT LINES!!!