While still in the pits, I click Start Driving, I then hit Video, which tells me the video will start after I cross the start/finish line. At the same time I start recording on the goPro. After the session has ended, I have lap times in the lap list. When comparing the times recorded there with the ...

I'm new to this forum, but did a search regarding lap time accuracy and found one topic relative to GPS accuracy of the iPhone 4, 4S, 5, etc. I apologize if this has been answered before. What I'm looking to report or found out is why my Harry's Lap times are substantially different than ones record...