Side imaging fish finders have found their way into every tournament angler’s boat. The ability to scan for structure, weed edges, and fish helps anglers stay dialed. Side imaging works similarly to ...

I came across an advertisement from a sporting-goods store for sub-$150 fish locators, and was curious to find out what made these things tick. The FishFinder 535 from Humminbird, Figure 1, is an old ...