Admiral Ozzel's fatal blunder

I think this is probably also backed up by this dialogue: "Calculate every possible destination along their last known trajectory."

 

Thank you for actually providing examples to back up your assumptions. I still think it was the Rebel Fleet. I suppose we'll just have to agree to disagree on this one.

 

In addition to navigational hazards, there was also the difficulty inherent in communicating with a starship while traveling at hyperspeed. Since ships in hyperspace did not exist, in a conventional sense, they were largely cut off from conventional radio or subspace communication, since wavelengths of any signal would be massively distorted even if they reached the vessel. Hypercomm signals could reach a vessel in hyperspace, however it was very difficult to communicate in even this fashion unless the signal was sent from one end or the other of the traveling ship's course, or between ships on the same course.

The same difficulties presented to communication also applied to sensors; it was nearly impossible to maintain sensor lock on a vessel in hyperspace, which made escape to lightspeed a very robust retreat option in most engagements. The only option available for pursuit was generally to plot several courses along the target's last known vector, and try to guess where the ship would come out of hyperspace for course corrections. This was generally a losing strategy, of course, since most ships wishing to avoid pursuit would plot a short jump, followed by a longer one to the destination at a different vector before enemies could arrive. The best option was to place a homing beacon on the enemy ship, but at large distances only HoloNet-equipped tracking devices were useful, and these were fantastically expensive.

An interesting phenomenon associated with hyperspace travel was Cronau radiation. This was a short, but powerful burst of radiation which was generated when a ship entered and left hyperspace. It could be detected by properly aligned sensors from a few light-seconds away, often well outside normal sensor radius. This was how the Rebel base on Hoth was able to prepare for the oncoming attack when Admiral Ozzel mistakenly took the Executor and its battle fleet out of hyperspace too close to the system, rather than approaching stealthily from outside the system.