900 Series™ Introduction
Your 900 Series™ Ultra Wide Screen Fishing System comes in several different configurations. See the following list of products, all of which are covered by this manual, to find your 900 Series™ configuration:
•Humminbird® 917c Combo: Ultra Wide Screen Fishing System with Chartplotter (Maps) and DualBeam PLUS™ 200/83 kHz Transducer, GPS Receiver included
•Humminbird® 957c Combo: Ultra Wide Screen Fishing System with Chartplotter (Maps) and QuadraBeam PLUS™ 200/83/455 kHz Transducer, GPS Receiver included.
How Sonar Works
Sonar technology is based on sound waves. The 900 Series™ Fishing System uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer.
Your 900 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
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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