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I had to disable carplay to get the bmw Laptimer app to work. iPhone had to be attached via USB plug in armrest.
I used on autocross, was nice to playback my laps and see my fastest speeds and g-forces and braking on each lap and compare. I was using 2nd gear mostly (dct) and laptimer helped me see the light of going into 3rd gear in a few spots.
I will always use it on autocross going forward as it is useful info. Also it overlays the tracked car with data over an airphoto (slightly off with gps drift) but still good. My iPhone could not be tucked away, it needed to be out in open for good god signals.
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