Thanks a lot for your reply Pete,
I had monitored the GS and GPS GS, TAS and IAS with two different aircrafts, the A320 PSS and the B737 default in FS2004, and SB not runing, and this is the results:
wheather winds setup at 007 deegres and 0 knots
TAS and IAS seems to be correctly, but GS is aprox. 50% of IAS at all the moments and the monitor GS GPS is exactly the same. Increses TAS and IAS, then increses too GS and GPS GS, but GS displayed at the default Garmin GPS is normal. The aircrafs are runing slowly, like the ground speed monitored...
I think is a problem of my configuration in FS2004, but i don´t know what can i do. I´m using FS2002 for two years and i never had a problem with it. I find two questions like this in other forums os SB, AVSIM and simsclients for other users and there are no replys for this questions.
I had reinstall FS2004 and the problem is still there.
Thanhs again for your reply.
Regards
Fernando Cobos