Chinns escape, and rhinkars clouds r the split 1's at the start i think, but i've seen split military blow them up b4, in which case they'll respawn somewhere else after a while, 1 way of finding out if theres one in sector is to use the best buys locator, look 4 something u can buy at a pirate base weed, space fuel etc, and if its on the list, with "unknown" shown then theres one in that sector, of course finding it could b trickier