Well did a forum search for all posts with the word Navigator or Aviator and looked at all 40 pages. No luckAfter looking at both online, it appears the only one that might have a chance of working is the Aviator as the Navigator has part of the dash attached to it and is much larger than double din size total. The aviator looks like it might work..though not sure how you would secure it in the dash...
Ah ha! Well not exactly but there is some talk of a factory navigation system. I dont think its touch screen though. Pic is in post #31
http://mercurymarauder.net/forums/showthread.php?t=49583&highlight=custom+harness&page=3