![]() ![]() Because sound waves travel at roughly one mile a second in water, sonars can send multiple pulses per second. Once a returning pulse is received, another one is sent out. It also measures the strength of the returning pulse – the harder the objects, the stronger the return pulse. This information enables the device to judge the depth of the object it reflected off. It’s the same echo-location system bats and dolphins use. The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. ![]() ![]() A sonar device sends pulses of sound waves down through the water. SONAR stands for SOund NAvigation Ranging. ![]()
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