Dazed and confused.
Join Date: Jul 2008
Location: Dublin, Ireland
I think hundreds of kilometres is a bit much. They could easily be a few miles long though, which, when seen through the enhanced eyes of a SM in space, which is a lot clearer than in an atmosphere, I think they'd easily be visible.
I think someone in possession of the Battle Fleet Gothic rule book might be your best source though. It might have the fluff on them.