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I've been running Harry's whenever I go out. Seems to be OK and pretty close to PDR times, only downside I've noticed is that it will typically miss a lap or two during a track day. I'm assuming this is due to the poor resolution of the phone GPS. Another friend of mine running Harry's has it linked to a GoPro for video that shows the data overlay, and the GPS speed and map are always off as well. Getting an external GPS would be best, but Harry's is still a decent and (relatively) cheap starting point.
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2017 SS 1LE.
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