Will you be using the OBC's built in STOPWATCH? Ifyes, Iwonder if they work in cohoots with one another....BMW's built-in way to protectyou from getting speeding tickets.

(I kid)
Just in case someone didn't know...the high cluster/high MID (and Nav screen) has a STOPWATCH feature...and you can see the symbol (far right on MID display in pic below) when it is initiated: