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The Fishfinder 240 uses sound waves (sonar) to detect infor-
mation about the underwater environment. High frequency
sound waves are transmitted toward the bottom through a
transducer that is mounted below the waterline. When the
sound waves make contact with the bottom, a fish, or some type
of underwater object, the sound is reflected back toward the
transducer. The transducer receives these reflections (echos)
and sends the signals to the unit to be processed and displayed.
Introduction
HOW THE FISHFINDER WORKS