How do you cross the Atlantic when there is nats and no airways. Flightaware gives the nat coordinates when flying across the atlantic-but I was wondering how do you do the same with fs2004/fsx?-and how can you use navdatapro to fly nats across the Atlantic?

Doesn't make any difference which data set you use (NDP or Navigraph) since neither contains the NATS tracks.  What is important is the FMC of the aircraft you are using - you enter the coordinates in whatever format the FMC will accept.

 

DJ

Would the level d 767 fmc be suitable for the nat tracks?

Yes