How does the Boxster determine it's speed?

[KRAM36]

Originally Posted by JayG

just load waze or a speedometer app on your phone and you can easily see what your speed is relative to the speedo

And Qmulus is far from a jackass

I don't put apps on my phone. Google gets enough info off me with just the crap that's loaded into Android phones. I want to figure the percentage of difference on my own and I need to know how the Boxster 986 determines it's speed. Front tire rotation speed, rear tire rotation speed or neither?

In this case he was being a jackass.