Maps for your navigation system. Thanks to Porsche Classic, your classic car won’t change. But the maps for your navigation system will. That’s why a new update (as of Q2 or Q3 2018) for your Porsche Classic Radio Navigation System (91164529100) is now available on a micro SD card (8 GB). It is available at your Porsche Classic Partner or Porsche Centre, meaning it’s incredibly easy to stay up to date.