Date: 4/11/2018
Lap Time: 2:15.85
Car: 2006 BMW M-Roadster
Event: VIR Club Day
Group: Touring
Camera: Hero6

Harry's Laptimer with my iPhone and BadElf GPS attached

Note:

I'm not sure why the speed on the GoPro GPS was jumping around.

GPS was great in Harry's LapTimer thanks to the BadElf GPS attached via the lightning connector. Much more accurate than using the iPhone's GPS for timekeeping.