DIY. Per the Fog of War, physical locations of space and ground units are unknown until you get scanned. So theoretically any, all, or none of your ships could be at a specified location. It's up to you when you get scanned.
I'm only partially worried about the potential meta-gaming abuses of the Fog of War, but I think it gives us a valuable trade-off by keeping some things mysterious, given then hyperspace destinations have to be posted.