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There's the software that comes with the adapter and then there's additional software (which you may "purchase separately") that does a bunch more stuff... you'd have to browse through the ScanTool site to understand the diff. I think I chose the additional software because that seemed like the best way to integrate with GPS.
I believe the price for the OBD adapter and the SW is ~$40 on the ScanTool site vs ~$30 on Amazon.
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