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I use Harry's with a Kiwi bluetooth OBD and a Dual GPS
I find it works well and very accurate, typically within .05 seconds off of the transponder times
The dual GPS is 5 hz and the builtin GPS in an iPhone is 10 hz so around 15ft IIRC for the 5 hz
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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