The speed is substantially wrong in some places in an exported video and exported logfile. It looks very correct most of the lap, then in some places slowly drops too low and then (via magically high acceleration) picks up to the correct speed again. I'm very unhappy not to be able to trust the logfile data.
Corresponding video: https://rejsa.nu/forum/viewtopic.php?p=1524351#1524351
Would be very grateful if this could be looked in to.
Android 6.01 on a OnePlus One phone
BMW M2 -16
Circuit Tools 2 to look at logs