Finally noticed the locations already published above by Tk-421 for the coalition.
New Coalition main
The rfa has been updated too:
Better? Anything missing? Please be specific.
As for how *I* find locations, I just enter 'stats 1' in the game console (an alias for the longer command) and look around. It takes some getting used to, but I've learned to read my location now. When I'm a little uncertain, I'll point myself due North (as close as I can) and move just North and South. I just write down the decimal portion, and ignore the fractional part. Then in the .con, look for an existing object, and place my new object offset from the existing location.
Always try to move a new object in-game and see the next one spawn. If it blows up by itself, then the middle number (Z in the X/Z/Y position) may be wrong. I'll write down the altitude (with precision) of my soldier's eyes, for both the new location, and the location where the same type of object spawn elsewhere on the map. Then compute the difference between the Z location specified for the existing spawner and my eye level, and use that to determine the correct altitude for the new spawn location. (Make sense?)