Use correctly!

Some of these kids who dont even have a car must realize you have to keep it vertical and still while in your car (e.g. Cupholder or docked). At a standstill hit start and then go. Fairly accurate if used correctly. Doesnt work off navigation, it works off movement...so yes, moving it forward by tilt will accelerate you pretty quick.

DrJeremy28 about BMW M Power Meter, v2.0