Yes you can get the line to show up in FS2004 gps.
In order to do this you have to change a setting in fs9.cfg file it is in the area where the map view is.
I can not rember the name of this area but look for line of code like show_ndbs=0
show_flight_path=0
show_vors=0
etc. there are three seperate sections that have these lines in them one is for the map, one is for the gps. and one is used when you edit flight plans.
if you want to see a line in the gps you need to change the show_flight_path=0 to show_flight_path=1
0= no 1= yes so change any 0,s to a 1 will display that feature.
If this confuses you drop me a line and when I get home I can send you the exact lines and what section they sre in.
