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® 1157c/1157c NVB DualBeam Combo: Ultra Wide Screen Fishing System with
Chartplotter (Maps) and Dual Frequency Transducer, GPS Receiver included
• Humminbird® 1197c/1197c NVB SI Combo: Ultra Wide Screen Fishing System with Chartplotter
(Maps) and Side Imaging and Dual Frequency Transducer, 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.
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