This is a great example of arches. Thesefish were in my cone angle and nowthey’re gone. If those fish were still in here undermy cone angle under the boat there willbe a solid line. Now the neat thing aboutthe lines that will go up and down youcan tell those fish are there but it’llstill be in the screen. Right now thereare no fish down there. If I take my baitand I drop it down we’re gonna watch. . . mybait go down. . . okay so that’s me – that line. A line means that it’s in under the boat. That signal is still there. If I raise itup it comes up. If I lower it it goesdown. That means that I am still there -I’m in that signal. If there’s a fishthere he’s going to show up as a line soI can watch the two lines meet. Ifthere’s a fish down there I drop my lineto meet the other line which is the fish. That’s the difference. Arches mean theyhave come and gone. A line means is thatfish is still there. So a big key whenfishing vertical is knowing thedifference of arches and lines. You wantto see lines – that means they’re stillthere. Let me see if I can get one tocome in the screen here this top line isme. Okay so I have a fish coming up tolook at me right now. That’s him on thebottom that’s me on the top. He’s stillthere looking at it. Another one’s comingup to it. . . . I got him! It’s cheating! I’m telling you! It’s a nice one too!Okay so what people don’t realize is thedifference between an arch and the lineA line on the graph means that signal –that interference – that thing that’sbetween bottom and boat is still there. It’s showing that target still there. An arch means that the target has come and gone is no longer in the cone angle. The cone angle is a signal sent from transducer to the bottom, bounces off thebottom comes back up and then reads iton the screen. So the line meansthat when it bounces down, it sees it. When it goes down it sees it, when itbounces up it sees it. It’s continuing tosee this fish or my bait down there. A line is going to tell you that that fishis directly under the boat.