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Answer:
I could spend a lot of time answering this question but I would rather have the manufacturer do it
instead.
Traditional Sonar, 3D Sonar and Side Imaging Sonar
--> 900 Series: http://www.humminbird.com/compChart.asp?ID=869
--> 700 Series: http://www.humminbird.com/compChart.asp?ID=850
--> Matrix Series: http://www.humminbird.com/compChart.asp?ID=870
The above will allow you to compare Humminbird's sonar and give you a pretty good description of their products.
Sonar Technology
Single Beam, Dual Beam, Dual Beam Plus, Tri Beam, Quadra Beam +,
Wide Side, 3D Plus, Side Imaging.
--> http://www.humminbird.com/productLines_wide.asp?ID=788
Everything you wanted to know about how the sonar works.
Prices for fish finders vary, so you will have to focus on your application.
What is it that you really want to accomplish?
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