When we read data from our fish finder, we usually imagine that the information we see on our screen is all happening directly under our sonar. So, if we see a fish on the screen, we think it must be exactly underneath our sonar. In reality, the readings we see are taken from a wider area underneath our sonar. And even more importantly, the sonar receives data from a wider and wider area, the deeper you scan. This is all because sonars scan in cones.
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