Not every lap you drive is a fair comparison. A spin, a red flag, or a lap that started mid-corner shouldn't count toward your best lap or your session average — so LapperSnapper checks every lap automatically and flags the ones that don't look like a clean, representative run. You can always see why a lap was flagged, and you can override the decision at any time.

How automatic detection works

Each time you open a session, LapperSnapper compares every lap against the others in that session — lap distance, sector data, and lap time — and sorts anything unusual into one of five categories. Two of them are serious enough that the lap is excluded from your stats automatically; the other three are just flagged with a badge so you can take a closer look, but they still count.

Excluded automatically:

Incomplete lap -> The GPS trace is missing a big chunk of the lap, sector data is broken, or (without GPS) the lap time is far too short to be real.
Unusually slow-> The lap took noticeably longer than your other laps — a spin, traffic, or a warm-up/cool-down lap.

Flagged, but still counted:

Unusually short -> The lap covers the full distance but is faster than seems plausible next to your other laps. We flag it rather than hide it, since it might be a genuine fast lap.

Out lap / in lap ->The first or last lap of the session, which is often a partial-pace lap in or out of the pits.
GPS dropout at a lap boundary -> Your GPS signal briefly dropped right where this lap starts or ends, so the lap time may be slightly off.

A couple of things worth knowing:

• Nothing is ever deleted. An excluded lap is just left out of your best-lap and average-lap calculations — you can still see it, review it, and re-include it.

• Detection needs a full picture. The slow/short/out-in-lap comparisons only run once a session has at least 4 timed laps to compare against. In shorter sessions, only the "incomplete lap" check applies.

• It re-evaluates every time, based on your current set of laps — it isn't a one-time judgment baked in when you drove the lap.

How to manually mark a lap valid or invalid

If LapperSnapper gets it wrong — or you want to exclude a lap it didn't flag — you can override any lap by hand:

1. Open the session and go to the Laps tab.

2. Long-press the lap you want to change.

3. The lap immediately flips between valid and invalid. You'll see a confirmation with an Undo option if you change your mind right away.

Look for these indicators on each lap row:

• A greyed-out row with a solid block icon means the lap is currently excluded from your stats. Tap the icon to see why.

• An outlined block icon means the lap was flagged as possibly invalid but is still counted — worth a look, but not excluded.

Your manual choice sticks and travels with the session — if you're signed in with sync enabled, it's saved to your account. If you flip a lap back to match what automatic detection would have chosen anyway, your override is cleared and the lap goes back to being decided automatically; otherwise your choice is locked in until you change it again.