Hey there, I may be able to answer this and i really hope it explains it clearly. When doing transatlantic routes and having experience from doing flight from USA to France i have the same thing that happens. When you installed explain and it asks you to install scenery hopefully u also installed the water regions in between the americas and Europe. this could be one reason why the NAV points are not loading in is because the scenery is not installed and x-plane defaults to water for scenery. Another thing that could contribute, I had the same thing when i flew over canada to europe the waypoints just stop over the ocean then pick back up over land. There could as well be no NAV points over the ocean, eel because its the ocean it would be kinda weird to have floating bouees with NAV points on them wouldn't it? anyways the plane probably only reads the NAV points up to a certain distance before terrain underneath it stops and you feel like your flying blind. Also it is possible for you to fly to your next waypoint with "NON-existant" scenery, though you may endue typing it into the planes FP system just to get it. In all cases with my experience, when i fly from JFK-CDG, my waypoints for my route stop once I'm over water. though since it really isn't much of a mistake the plane just fly along like in real life and i manage to endue somewhere around scandinavia so i know how you feel. I hope this clarified something, maybe a little if not any. i tried, thats what counts. Maybe someone else would have a better explanation on this than i would.