Jamestown Distributors TV: Humminbird: Introduction to Sonar. This video provides a brief introduction to sonar technology. You can find Humminbird fish finders with DualBeam Plus technology at http://www.jamestowndistributors.com/userportal/search.do?freeText=humminbird%20dualbeam%20plus&page=GRID. Visit http://www.jamestowndistributors.com for all your project needs.
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