It appears he's only showing the systems that are identifyable on a starmap.
What do you mean?
Gamma Draconis is a real star and very much identifiable on a star map. It's the brightest star of the constellation Draco. Its co-ordinates are:
RA 17h 56m 36.4s
Dec. +51° 29' 20.3''
Distance 148 ly
That would place it about... Almost same direction as Vega, less than ten degrees northeast (or "up" and "right") from it (viewed from Earth), but it's six times further into space.
There are, however, fictional systems in FS2. Here's a list of them:
Ikeya (there's many comets partially named by astronomer Ikeya, and one asteroid, but no star or star system.
Shivan Nebula (although there have been propositions about which nebula it could be, most notable candidates being Lupus Nebula [SN1006 Supernova remnant] and Crab Nebula [SN 1054 Supernova remnant], although it could be some other place altogether.)
Binary System beyond said nebula - even less clues as to whereever this may be.
I don't recall any other fictional canon systems. Others should be based on real life counterparts.
Then there are multiple non-canon worlds that aren't real star systems:
Tau Sigma (I've always wondered if this was actually supposed to be TAu Ceti, which would've been a real star...)
Gehenna Cygni (although if the spelling is b0rked.. Gamma Cygni would be a real star.)
Transcend's dark nebula
Then there are many uncharted systems seen in passing during some of the "Escape Enemy through multiple jump corridors" campaign...
It's a simple co-ordinate transformation from sphere co-ordinates used in astronomy, into cartesian (XYZ) co-ordinates used in modelling programs. Its almost simplest possible example of space vector calculations, and it really isn't as intimidating as someone might think.
It's not really that much math, I just felt like explaining how the co-ordinates are converted first into degrees, then into X-Y-Z values.
Feel free to disregard that post, though.
EDIT: Moved Laramis to correct group...