Reading Sonar Correctly for Vertical Fishing

This is a great example of arches. These
fish were in my cone angle and nowthey’re gone. If those fish were still in here undermy cone angle under the boat there will
be a solid line. Now the neat thing aboutthe lines that will go up and down you
can tell those fish are there but it’llstill be in the screen. Right now there
are no fish down there. If I take my baitand I drop it down we’re gonna watch. . . my
bait 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 goes
down. That means that I am still there -I’m in that signal. If there’s a fish
there he’s going to show up as a line soI can watch the two lines meet. If
there’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 that
fish is still there. So a big key whenfishing vertical is knowing the
difference of arches and lines. You wantto see lines – that means they’re still
there. Let me see if I can get one tocome in the screen here this top line is
me. Okay so I have a fish coming up tolook at me right now. That’s him on the
bottom that’s me on the top. He’s stillthere looking at it. Another one’s coming
up 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 the
difference 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 it
on 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 to
see this fish or my bait down there. A line is going to tell you that that fish
is directly under the boat.

About the author