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Message: <blockquote data-quote="GilK" data-source="post: 502655" data-attributes="member: 34315">Sorry to say but that isn't going to happen. SOund NAvigation and Ranging works by sending out sound waves of a certain frequency and looking for the reflections. By the time the reflections from a fish (relatively small) get back you are way past it. It works the same whether looking downward or to the side.  Down sonar your going to get a reflection from the bottom which will be strong enough to get a reading but you won't get an accurate "picture" at higher speeds.     To demonstrate this, find a spot that has a submerged structure (tree stump,  reef or whatever) and go over it at high speed and then go over it real slow (1-3 knots). You'll see much more detail.If you are looking for fish you have to go slow.</blockquote>