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Reading transducer

Old 07-10-2019, 03:29 PM
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I had someone tell me at idle speed if your transducer is on the transom as soon as you see an object start across your screen you have already passed it. I have also heard when is reaches the middle of the screen it’s under the boat . Who knows the true answer?

Last edited by Willyt123; 07-10-2019 at 06:21 PM. Reason: Easily answer
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Old 07-10-2019, 06:23 PM
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https://www.sonarwars.com/fish-finder-how-to/

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Old 07-11-2019, 10:15 AM
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Originally Posted by Willyt123 View Post
I had someone tell me at idle speed if your transducer is on the transom as soon as you see an object start across your screen you have already passed it. I have also heard when is reaches the middle of the screen it’s under the boat . Who knows the true answer?

The simplified and not completely accurate answer is the transducer is pinging down (for this answer, we'll assume straight down). If it's mounted on the transom, it's pinging under the stern so if you're moving forward, what you see first as the image scrolls across the screen is what the transducer has already slightly passed over.
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Old 07-11-2019, 05:23 PM
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The transducer beam is a cone, so the deeper the water, the wider the footprint, so harder to pinpoint the exact location of a target. Another factor is that the cone is as wide as it is long, so the target you see could actually be abeam the boat.
Add to this the roll and pitching of the boat, further widening the beam.
You can select a transducer frequency that is most optimal for the average depth that you fish in, and many are dual beam 50/200.
A good technique for locating targets is to run over them at right angles, mArking on the chart plotter to pinpoint them.
Then all you have to do is figure in the wind and current and hopefully drop the anchor in the right spot!
Sometimes it’s just as well to get fairly close and drop a shitload of chum.
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