I have been flying using the default 737-400 model and it's cruise speed is listed at 477. Yet when I am flying this aircraft, even at cruise altitude, I get an overspeed warning alarm whenever I go above 345. WHY?[br][br][div align=center][br][link:members.cox.net/fstimes/wetimage.html]Click Here For Weather Image of the Day!

477 is obviously ground speed or true airspeed. Your cruising "Indicated airspeed" will be much lower than that. I know in the 737-400 mach .82 is pretty much the limit, which at approx. FL330 would be about 290 knots.

Thanks, I thought that it might be something like that, because the GPS's ground speed is always higher then the airspeed.