From what I can see, the diff in 500 & 700, 500 doesn't have switchfire sonar and is not upgradeable. The 700 series has the switchfire sonar, dualbeam plus, and is upgradeable & expandable. If you go to Hummingbird website, you can check each out. They do appear to have a very good price on 788CI HD @ 619.00 brand new.
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