Dedicated units often have some controls for signal gain or for other features. It will have some mechanism to display the results, ranging from a flashing light to color LCD graphic maps. The processor/display is a group of electronic circuits that interprets the signals received by the transducer. When part of the acoustic signal strikes an object, it is reflected back to the transducer, which receives it and sends it to the processor. This signal passes through the water at a known rate of speed and is reflected off any object with a density different than water. It is placed in the water, or in a medium adjacent to the water, and emits an acoustic signal with a characteristic waveform. The transducer is both a sender and receiver. Whether it's a simple portable fishfinder or a commercial mapping system weighing several tons, all sonar devices operate on the same principles using two parts: a transducer and a processor/display. What once was a simple electronic device meant to determine the water's depth now has numerous capabilities to find fish, scan the bottom for obstructions, or create underwater maps. As the technology of sonar (an acronym for Sound Navigation and Ranging) has developed, prices have dropped dramatically at the same time that choices have widened.
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