How Sonar Works
Sonar technology is based on sound waves. The HDR 650 Digital Depth Sounder uses sonar to determine depth directly below the transducer. Your HDR 650 Digital Depth Sounder consists of two components: the HDR 650 sonar unit and the transducer. The sonar unit contains the transmitter and receiver, as well as the user controls and display. The transducer is mounted beneath the water surface and converts electrical energy from the transmitter into mechanical pulses or sound waves. The transducer also receives the reflected sound waves and converts them back into electrical signals for display on the sonar unit.
Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back again in less than 1/4 of a second. It is unlikely that your boat can "outrun" this sonar signal.
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