I bought the NAV update DVD to update it, from the 2105 version, I received a disc, put it in the DVD player, and it trys to read it, but then gives a bad disc error message. I called Here (the vendor for the NAV updates) and they sent me out a new disc, but it does the same thing. So, I am assuming it's a Pilot (no pun intended) error. Anyone else had this situation that can point me in the right direction. Oh, I put a normal DVD in the player, and it reads it and plays just fine, so I am thinking it's not the player. Any advice would be appreciated.