System co-ordinates

[Bellepheron]

For Groshyr. I understand your answer but if 0,0,0 is the center of the map and most items are on the plane then those items are not relative to the center of the map and the center of the plane is a reference co-ordinate in it's own right. However it is a good theory to work on and St.Denis has a neat working model which works as I have just tested. 2 good practices to work with.