Ideally random spawn ones but you can make them random using this format:
Mapname.txt contents:
Code:
-925.712646 619.362671 32.031250 0.000000 0.000000 0.000000
-916.458618 54.687298 32.031250 0.000000 0.000000 0.000000
-588.460449 -391.503601 64.031250 0.000000 0.000000 0.000000
-230.562317 -408.382446 32.031250 0.000000 0.000000 0.000000
154.693344 -317.115204 96.031250 0.000000 0.000000 0.000000
400.704224 -276.406708 96.031250 0.000000 0.000000 0.000000
406.996918 295.440582 96.031250 0.000000 0.000000 0.000000
511.968750 -229.164429 256.031250 0.000000 0.000000 0.000000
389.250458 178.964127 352.031250 0.000000 0.000000 0.000000
292.480865 1008.438721 328.031250 0.000000 0.000000 0.000000
-355.334198 881.123840 328.031250 0.000000 0.000000 0.000000
-1035.290527 1028.774170 385.018890 0.000000 0.000000 0.000000
-207.052460 604.457031 256.031250 0.000000 0.000000 0.000000
20.455803 729.324524 112.031250 0.000000 0.000000 0.000000
337.120514 535.183960 72.031250 0.000000 0.000000 0.000000
-472.294617 27.607477 304.031250 0.000000 0.000000 0.000000
-119.689499 -74.003250 304.031250 0.000000 0.000000 0.000000
-577.553162 78.344536 448.031250 0.000000 0.000000 0.000000
-269.165588 -130.021881 512.031250 0.000000 0.000000 0.000000
83.222977 937.097351 595.031250 0.000000 0.000000 0.000000
-526.474426 913.055908 595.031250 0.000000 0.000000 0.000000
400.470490 -25.649149 768.031250 0.000000 0.000000 0.000000
319.968750 220.349579 640.031250 0.000000 0.000000 0.000000
408.824463 -26.255980 640.031250 0.000000 0.000000 0.000000
-272.370148 856.829102 489.031250 0.000000 0.000000 0.000000
513.783569 858.645508 489.031250 0.000000 0.000000 0.000000
Where as those are the coordinates for the custom spawn locations. (example from aim_ag_texture_city_advanced.txt)