How does a fishfinder work?

I recently purchased a fish finder and I have never used one before. My only issue with understanding how to use one is that the one I have projects a two dimensional image. I have a couple questions about this.

My first question is since it only projects a 2D image, do I have to position the transducer a certain way? For example, if I point the transducer north, will it give me the reading of the lake bottom pointing directly north (directly where my transducer is pointing?

If I anchor the boat so I do not move, why does the screen still scroll?

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4 thoughts on “How does a fishfinder work?

  1. It’s looking straight down at the bottom. The image (line) coming onto the edge of the screen is what’s below you right now, the line an inch or so over is what was under you five seconds ago, and so on. The direction the boat is pointing and the direction the transducer is mounted have nothing to do with it.

    If the boat is moving, the image will show what you went over, but if the boat is stopped, it will show the same bottom — no change, though the image will keep scrolling. But if a fish swims under the boat while you’re stopped, you’ll see a mark appear, then slowly move across and off the screen. But only the image as it appears on the screen is what’s under you right now.

  2. Yes,the transducer has to point straight down,it’s usually mounted on the transom,away from the prop area,so it doesn’t get interference from it,and well below the waterline,so you won’t get false readings from wake turbulence.called cavitation.The reason it still scrolls when you anchor is it’s reading the bottom constantly,whether you are moving or not,and when anchored,it will show if anything has come into range of it,like a fish swimming under the boat.It’s showing you an updated reading when it’s scrolling.look to the left edge of the screen for the most recent reading.

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