Diagram explaining system coordinations
Okay - systems positions are worked out as a X, Y, Z position of things, so X is left to right, Y is vertically up and down, and Z is back and forth.
So, -60000, 0, -60000 would be a position of the back left sector of you map.
0, 0, 60000 would be front center of the map
60000, 0, 0 would be far right side center, hope that is clear - just think like the diagram below, or perhaps try not too! Remember - 0, 0, 0 is the DEAD center of the system as you look at the map.
..................................Y
...................................I
...................................I......-Z
...................................I...../
...................................I.../
...................................I./
.............-X --------------+---------------- X
................................./.I
.............................../...I
............................./.....I
.........................../.......I
........................Z .........I
..................................-Y
