I'm finding the Microsoft Flight Simulaotr 98 and 2000 Downloads somewhat helpful and fun at the same time.
https://www.cnet.navy.mil/tw5/nawctsd/website/
FYI - the fixed/newer GPS model for 2000 looks identicle to the picture here
Unfortunately, all the files have are the aircraft and scenery. These downloads don't include the "Shell" found here https://www.cnet.navy.mil/microsim/nrotc/shell.htm
The last link has a 92MB ZIP beta file, but it's corrupt when you download it. Looks like they use the 92MB file in conjunction with the updated aircraft in the learning center.
You *MAY* have to be on a .MIL or .GOV internet server to download those files - not sure.
But none the less, I've found the aircraft to work fine ... GPS, VOR, and all.
Dunno, I'm gonna play with Flight Sim, practice VOR Nav between Whiting and surround air fields prior to me heading down in June 2003.
Good luck.
E