I was looking at the humminbird matrix fishfinders after reading your post. I really like the idea of being able to have a hand held gps that works with a fishfinder because I will also use it off the water. Which handheld units will work with a fishfinder? How does that work exactly? Is the handheld gps plugged into the fishfinder to act as a gps antennae? What type of plug is it? From reading the humminbird site it seemed like the only fishfinders that were not combination gps/ fishfinders and were gps compatible were the 700 series although I am most likely wrong.
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