USING THE TRACKER UNIT
HOW SONAR WORKS
HOW SONAR WORKS
Your Tracker unit uses sonar to locate and define underwater objects, define the bottom terrain, as well as deter- mine distance.
Sonar technology is based on sound waves. Your Tracker unit sends out a sound wave signal. With this signal it determines distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off an object. Your Tracker uses the reflected signal to interpret location, size and composi- tion of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth of 240' (70m) and back again in less than 1/10 of a second. It is unlikely that your boat can "outrun" this sonar signal.
The Tracker unit is a dual frequency, dual beam unit, and generates two dis- tinct sonar signals - one narrow, one wide. Each signal is optimized for a particular purpose. First, the center beam transmits at a frequency of 200 kHz in a 20 degree (narrow) symmetrical pattern for greater depth capa- bility and excellent detail. Information from this center beam is used to draw the graphic representation of the bottom on the display.
Second, the wide beam transmits at a frequency of 83 kHz in a 53 degree (wide) symmetrical pattern for greater area of coverage. Information from the wide beam is used to accurately detect the presence and location of fish. A wide beam has a large area of coverage but limited resolution of detail. A narrow beam has excellent detail, but within a limited area of coverage.
The combination of the two beams and dual frequencies provides the com- bination of a large area of coverage and a high level of detail.
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