For decades, anglers relied on fish finders with an inherent time delay. Today, however, a new breed of fish finder from brands such as Garmin and Lowrance eliminates the time delay, depicting the ...

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 ...