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in case there are other newbies like me trying to do this on a budget-
i compared racechrono using my phone’s internal gps vs the transponder at the track.
my phone has a 1hz gps refresh rate
track vs ( racechrono)
not bad for a free product, and adding an external 5hz gps sensor via bluetooth makes it way more accurate.
May 5-7, 2017
SKUSA Pro Tour SpringNationals
May 19-21, 2017
WKA Manufacturers Cup Series
June 2-4, 2017
United States Pro Kart Series