TP volume stands for Traffic Patrol Volume. Since this feature is a radio volume INPUT control that uses the same inputs as NAV, it actually increase the nav audio volume. To set the advanced features including TP volume see this post http://www.bimmerboard.com/forums/posts/154948

No Calibration is needed in the X5. The X5 never came with MKI (to my knowledge) which had a "calibration" feature.

Navigation Calibration is detailed in this document from BMW, page 35
http://www.bimmerboard.com/members/j...g%20manual.pdf

Martin
www.bimmernav.com