There is no doubt that you can catch fish with nothing more than a length of line, a hook and some bait (optional for certain types of fish). However, in the face of this well known fact, both commercial and recreational fishermen willingly invest hundreds to many Thousands of dollars in equipment intended to improve the odds of their catching the fish in which they are most interested, not just any fish that happens to swim by. Sonar technology, which has contributed so much to undersea warfare and to peaceful uses such as underwater surveying and locating sunken ships, has also made it possible for today's fishermen to visualize what is beneath their boats. The depth of the water, the nature of the seabed and the presence of fish are easily determined using modern sonar equipment. Equipped with specialized signal processing circuits and a time line display the sounder can become a fish finder. Carried to its limit, the fish finder can become undersea radar, searching through all or any part of a 360-degree azimuth and sweeping from straight down to horizontal in its search for underwater objects, including fish.
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