@Flamelord
They're able to track the direction in which the ship started it's jump, based on the effect jumping has on the space around it. Most FTL travel operates on one of 2 principles: bending space to allow for ftl travel, or dropping into another dimension temporarily. The Imperium is adept at the latter, I assume the Goa'Uld are using that as well. As such they're able to track the direction in which the ship moved at the start of it's jump. They then move along that line, stopping at every solar system in the path, although they wouldn't keep tracking after a certain distance. If the Goa'Uld were to exit FTL and then immediately make another jump, they'd probably lose the Imperium, or at least severely slow them down. It wouldn't make much sense to do, though, as they don't know they're being tracked.
Tracking jumps of a cloaked ship like that, BTW, is quite hard to do. Normal ships can't do it. But the Rock is a space station owned by the Dark Angels, who are obsessive about secrets and uncovering them. Hence why they developed an entire branch of psionics dedicated to extracting information from enemies mid-battle. So the Rock's sensors are pretty much the best in the Imperium.
They're able to track the direction in which the ship started it's jump, based on the effect jumping has on the space around it. Most FTL travel operates on one of 2 principles: bending space to allow for ftl travel, or dropping into another dimension temporarily. The Imperium is adept at the latter, I assume the Goa'Uld are using that as well. As such they're able to track the direction in which the ship moved at the start of it's jump. They then move along that line, stopping at every solar system in the path, although they wouldn't keep tracking after a certain distance. If the Goa'Uld were to exit FTL and then immediately make another jump, they'd probably lose the Imperium, or at least severely slow them down. It wouldn't make much sense to do, though, as they don't know they're being tracked.
Tracking jumps of a cloaked ship like that, BTW, is quite hard to do. Normal ships can't do it. But the Rock is a space station owned by the Dark Angels, who are obsessive about secrets and uncovering them. Hence why they developed an entire branch of psionics dedicated to extracting information from enemies mid-battle. So the Rock's sensors are pretty much the best in the Imperium.