Humminbird - Fish Finders and GPS
Humminbird - Fish Finders and GPS
Humminbird - Fish Finders and GPS
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900 Series Introduction<br />
Your 900 Series Ultra Wide Screen <strong>Fish</strong>ing System comes in the following<br />
configuration:<br />
• <strong>Humminbird</strong>® 997c Combo: Ultra Wide Screen <strong>Fish</strong>ing System with<br />
Chartplotter (Maps) <strong>and</strong> Side Imaging <strong>and</strong> Dual Frequency<br />
Transducer, <strong>GPS</strong> Receiver included.<br />
How Sonar Works<br />
Sonar technology is based on sound waves. The 900 Series <strong>Fish</strong>ing System<br />
uses sonar to locate <strong>and</strong> define structure, bottom contour <strong>and</strong> composition,<br />
as well as depth directly below the transducer.<br />
Your 900 Series <strong>Fish</strong>ing System sends a sound wave signal <strong>and</strong> determines<br />
distance by measuring the time between the transmission of the sound<br />
wave <strong>and</strong> when the sound wave is reflected off of an object; it then uses the<br />
reflected signal to interpret location, size, <strong>and</strong> composition of an object.<br />
Sonar is very fast. A sound wave can travel from the surface to a depth of<br />
240 ft (70 m) <strong>and</strong> back again in less than 1/4 of a second. It is unlikely that<br />
your boat can "outrun" this sonar signal.<br />
SONAR is an acronym for SOund <strong>and</strong><br />
NAvigation Ranging. Sonar utilizes precision<br />
sound pulses or "pings" which are emitted into<br />
the water in a teardrop-shaped beam.<br />
The sound pulses "echo" back from objects in<br />
the water such as the bottom, fish <strong>and</strong> other<br />
submerged objects. The returned echoes are<br />
displayed on the LCD screen. Each time a new<br />
echo is received, the old echoes are moved<br />
across the LCD, creating a scrolling effect.<br />
When all the echoes are viewed side by side,<br />
an easy to interpret "graph" of the bottom, fish<br />
<strong>and</strong> structure appears.<br />
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