GPS how to calculate a lap time

I'm working on a micro controller project that has GPS. Once a pick a starting/ending point. How do I decide when a lap is over?

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when the GPS says that you've done a certain distance (greater than 10m) and are in almost the same place as the starting point
lateapexAuthor Commented:
So.... pick a start/end waypoint

travel at least X distance

When current location is within (some small distance) from start/end calculate laptime.

Easy enough Thank you!
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