Common misreads

Everyone misreads a fish finder at first, and the experts still do now and then. The screen shows echoes, and different things make the same kind of echo. The cure is not to memorize shapes; it is to learn which things can look alike and to confirm with a second look, a second view or a cast.

A good habit is to say what you think a mark is, then say what else it could be. If you cannot name two other things it might be, you probably do not know enough yet to be sure, and that is fine. The next step is to check: pass over it again, change the view, zoom in, or fish it and see what bites.

Tap each card below to see a drawing of what you are looking at, then reveal what it usually turns out to be.

An interactive drawing goes here in the app.

On the water

• When something looks interesting, go over it again from a different angle. A real thing keeps showing up. Noise does not.
• Switch views if you have them. Something that looks like a smudge in 2D often turns into a clear tree or rock in DownScan.
• Keep notes. After a trip, write down what you saw and what actually bit. That is how the shapes start to make sense on your own water.

Easy mistakes

• Trusting a single mark. Look for a pattern.
• Deciding what a mark is before you check it. Say "that might be bait" and prove it.
• Forgetting that fish near the bottom are often hidden in the bottom band.

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