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How Sonar Works
Sonar technology is based on sound waves. The 700 Series™ Fishing System uses sonar to locate
and define structure, bottom contour and composition, as well as depth directly below the
transducer.
Your 700 Series™ Fishing System sends a sound wave signal and determines distance by
measuring the time between the transmission of the sound wave and when the sound wave is
reflected off of an object; it then uses the reflected signal to interpret location, size, and
composition of an object.
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.
SONAR is an acronym for SOund and NAvigation Ranging.
Sonar utilizes precision sound pulses or "pings" which are
emitted into the water in a teardrop-shaped beam.
The sound pulses "echo" back from objects in the water such
as the bottom, fish and other submerged objects. The
returned echoes are displayed on the LCD screen. Each time
a new echo is received, the old echoes are moved across the
LCD, creating a scrolling effect.
When all the echoes are viewed side by side, an easy to
interpret "graph" of the bottom, fish and structure appears.
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