1100 Series™ Introduction; How Sonar Works - Humminbird 1158c Combo Installation And Operation Manual

1100 Series™ Introduction
Your 1100 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
1100 Series™ configuration:
• Humminbird® 1158c Combo: Ultra wide screen Fishing System with DualBeam PLUS™
sonar and chartplotting. GPS receiver included.
• Humminbird® 1198c SI Combo/1198c SI Combo NVB: Ultra wide screen Fishing
System with Side Imaging® Sonar, DualBeam PLUS™ Sonar, and chartplotting. GPS
receiver included.

How Sonar Works

Sonar technology is based on sound waves. The 1100 Series™ Fishing System uses sonar to
locate and define structure, bottom contour and composition, as well as depth directly below
the transducer.
Your 1100 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.
1 Introduction