FS Navigator has to be purchased and requires a key which allows up-grades at no extra cost.
It is an excellent, well made program, confirmed by all the lucky people who use it.
I purchased it when FS 2000 first came out and then transferred it to FS 2002, using the key.
As far as I know, hopefully, it will transfer to FS 2004...

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Cheers all...!
Paul.
(England).
P.S. perhaps we should start an FS Navigator Appreciation Society....LOL...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.