The Sector Fleet re-published for MGT has a section in there on how squadrons/fleets jump together. This is what it states:
Squadron or Fleet Jump
Jump mechanics are not properly understood. Two similar vessels can enter Jump at the same time and place, with the same destination, and come out 2 days apart. This is not acceptable for fleet operations. The Imperial Navy gets around this in two ways. Jumps are made, where possible, into points distant from the projected location of enemy forces. This gives time for the fleet or squadron to reorganize itself upon arrival. However, it is not always practicable.
For this reason, all Navy vessels are fitted with Squadron Jump systems. These generate Jump parameters for a group of ships rather than a single vessel, and slave the systems of all ships to a central initiation circuit. The standard unit (which is very expensive) can cover a squadron of ships (or a convoy and its escorts). Fleet flagships are fitted with an even more complex system which can coordinate the Jump of a number of squadrons.
There is still variation in emergence, however. Using a linked Jump reduces variation in time to about an hour either way in most cases. Position variance is minimal. This means that fleets can Jump en masse and be ready for combat at the far end, but a fleet emergence is still an exciting time for all concerned, as vessels emerge in the wrong order, on slightly different vectors, and dispersed in time by up to 2 hours. The variance is greater for large fleets. A single vessel and her escorts are likely to emerge all together. Larger forces are not.
The problem here is that civilian ships have no method (at least in the published rules) on how they can jump and emerge relatively at the same time. Without that possibility it makes it nigh impossible for a civilian ship to ever be escorted or travel in pairs/groups. It's a fundamental flaw of the rules that is addressed well.
Sector Fleet missed a lot of editing too, as a number of sections are lifted completely from the previous version. Which isn't a big deal... normally. But when MGT changes how jump drives work and then new material is republished that refers to older MT explanation... well, you can see how players might get frustrated with the split message.