Purchase an overpriced add-on package just to use a FMC? You have to be kidding!
There is a FREE FMC available FS2004 from the guys at PR8 Software. Just goto:
http://fmc.scumari.nl/ It works REALLY well, uses the PSS Navdata, and even includes a female copilot to do the readouts.
Customizing the aircraft which it can be used with is a simple operation (if they have accurate .air files), it operates with Peter Dodsons stuff and even has links to FREE FD (a moving map) and a data analysis package.
Try it, its well worth the effort, and hopefully it will send a message to those money hungry sim software designers that locking their products operability is a loosing proposition
Enjoy
