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You don't really need to mark the start/finish. You can actually download the .gpx file for your respective track and save it to the SD card. It will automatically start tracking your lap times once you start the PDR and complete the first lap..
There's a thread on Corvette Forum where many members uploaded their .gpx files of the tracks they go to. Most of the tracks in the country are covered.
You can use the same SD card for multiple tracks. Just remember to remove the previous .gpx file and save the correct one for the track you will be visiting.
Marking the start/finish is an exercise in patience. Especially when you're trying to go hard out the gate to get heat into your tires.
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