I was using HLT with just the iPhone GPS, but I was not happy with the data resolution when exported to Google Earth. I picked up a DUAL XGPS 160 that provides 10 hz sampling and much cleaner looking data logs. You might be able to do something similar with this if it supports external GPS units.
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2017 Corvette Z06 7MT | 1LE | Stage 3 | DSCSport
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