Humminbird - Fish Finders and GPS
Humminbird - Fish Finders and GPS
Humminbird - Fish Finders and GPS
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Underst<strong>and</strong>ing Sonar History<br />
It is important to underst<strong>and</strong> the significance of the 900 Series display. The<br />
display does NOT show a literal 3-dimensional representation of what is<br />
under the water. Each vertical b<strong>and</strong> of data received by the control head <strong>and</strong><br />
plotted on the display represents something that was detected by a sonar<br />
return at a particular time. As both the boat <strong>and</strong> the targets (fish) may be<br />
moving, the returns are only showing a particular segment of time when<br />
objects were detected, not exactly where those objects are in relation to<br />
other objects shown on the display.<br />
Real Time Sonar (RTS®) Window<br />
A Real Time Sonar (RTS®) Window appears on the right side of the display in<br />
the Sonar View only. The RTS® Window always updates at the fastest rate<br />
possible for depth conditions <strong>and</strong> shows only the returns from the bottom,<br />
structure <strong>and</strong> fish that are within the transducer beam. The RTS® Window plots<br />
the depth <strong>and</strong> intensity of a sonar return. (See Sonar Menu: RTS® Window).<br />
The Narrow RTS® Window<br />
indicates the sonar intensity<br />
through the use of colors.<br />
Red indicates a strong return<br />
<strong>and</strong> blue indicates a weak<br />
return. The depth of the<br />
sonar return is indicated by<br />
the vertical placement of the<br />
return on the display depth<br />
scale.<br />
The Wide RTS® Window<br />
indicates the sonar intensity<br />
through the use of a bar<br />
graph. The length of the<br />
plotted return provides an<br />
indication of whether the<br />
return is weak or strong. The<br />
depth of the sonar return is<br />
indicated by the vertical<br />
placement of the return on<br />
the display depth scale.<br />
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