Navigation was part of the optional "tech package" offered until sometime around the spring of 2015. Without the tech package, you still had Google Maps on the big screen, but no turn-by-turn directions. The tech package also included autopilot convenience features and some other stuff like the power lift gate. It was optional on all the cars, I think in theory you could have configured a P85D with no navigation, although I doubt many actually did. Then they reconfigured the options, moving autopilot to its own option, putting the power liftgate in the premium package, and made navigation standard.