I came across a site today which interfaces FSX to GPS
bones talked about this some moons ago
"Found a great piece of software called Xmapsy.
This software transmits GPS data from FSX to any GPS navigation program running on a PocketPC.
It sends TomTom a bit wappy but works great with other GPS scrolling map programs.
The picture below shows my HP iPAQ running a demo of PocketFMS.
It works great and the PocketFMS maps are excellent".