Similar to others experiences, when m lap timer is working it has some pretty basic data that is useable. But in a four session day I'll usually have two sessions that don't track (and of course these will be the two sessions I want to review the most). Connection is spotty and even if it does record, it won't necessarily track your lap times, so it's pretty flaky. I also had to disable carplay for it to work through Bluetooth to iDrive.
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