Technically, Ship Sector is a map on which the battle takes place. Plot-wise it is the ship's location on which the Nofts are locked
We are rummaging the whole universe in search of Astron. As a rule, uninhabited planets offer more resources. Occasionally we come across some valuable stuff on abandoned ships, asteroid fragments, and even space junk. Sure thing we can’t just effortlessly show up and take what we need - we have to fight for resources. We must move fast as no place out there is safe enough to be around. If the soldier is lucky enough to survive and, more importantly, reach the spot where the Replicator will pick them up, only then can we get some Astron.