My GTN650 is giving me regular "GPS LOST" messages (I suspect the problem is the antenna). I am trying the use the internal flight plan loaded from the GTN650 (GNAV1) with the AFS gps (GPS2) which is not affected by the "GPS LOST" problem. But when I assign the internal flight plan to GPS2 I lose the flight plan. When I assign the map source to GPS2 I have my position but no flight plan. When I assign the CRS to gps 2 I lose my CRS. How do I use GPS2 with the internal flight plan loaded from GNAV1?