I already have an application (in
VB.NET) that does this. StarTraX
(
http://gpsanimator.com). The released (free) version takes a pre-
recorded GPS track and presents it in GE. I have an un-released
version that takes a real-time NMEA stream and presents the track in
GE.
Have a look and if you're interested in the NMEA version - let's chat.