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Ever wonder how much real estate your looking at when using your fish finder. This might help.
[url "http://www.furunousa.com/LearningCenter/Transducer-Beam-Angle-Calculator.aspx"]http://www.furunousa.com/LearningCenter/Transducer-Beam-Angle-Calculator.aspx[/url]
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Nice.... good info...tks.
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In lakes with depths of only about 20 feet, that explains why we see so few fish on the screen. They are there, but maybe only a few feet to the side -- even less if they aren't on the bottom.
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Its simple trig. Here's what I really want to know... when you see a fish arch first show up on your screen, where is that fish in relation to your boat?
Assume the transducer is on the transom and it has a 40/10 degree beam angle.
Obliviously it depends on what depth the fish is at, what processor speed your fish finder has, and any pitch angles.
Here is how I have thought about finding out: It may require a few tests where you tie small balloons to bricks and mark where you drop them. Dropping them at different depths and drifting over each waypoint to see where you first see the balloon on the fish finder and mark that waypoint. Then you can go back and calculate the distance between the drop waypoing and the new marked waypoint at that depth of water. The data can then be graphed and a chart made so you can interpolate at whatever depths you find yourself in.
Unless you know if the manufacturer already provides that data...? Thoughts anyone?
The reason I want to know is if I am trolling along and I come upon a big fish on the screen, how much time do I have to hit the anchor button on the trolling motor in order to be right on top of the target fish?
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