*** EVEN MORE SPOILERS ***
That would be entirely up to the referee. There are hints in the rumors that something is going on at Inchin, but no easily found smoking guns either. Alternatively, there are red herrings that might well take your Travellers' capital ship into the space surrounding Trexalon, which could lead to a quite different adventure, one in which they gradually discover that Captain Vinsen's wishful thinking has inaccurately pointed them at the Trexalonians. There is also the possibility that the Travellers intercept the stealth courier at Collace's outer-system gas giant moon, Auros. Doing so might very well lead them directly to Inchin should they somehow capture the ship and obtain its flight logs or interrogate its crew effectively. Also at Auros, the Travellers might learn of the recent presence of Tondouli pirates, whose world is within striking distance of Inchin, possibly leading them in that direction.
In short, there is no deus ex machina event that sends the Travellers to Inchin, leaving it up to the referee how to bridge the gap. The referee has all the facts about events in the region, and then allows the Travellers to figure out what's going on. This may seem like a plot hole, but it was by design. Naval campaigns are largely based on the events that occur on a capital ship. Exploring the District 268 subsector, establishing relationships with the Collace Planetary Navy, and trying to solve a mystery are all part and parcel to the adventure, giving the players an extensive amount of time to adventure on their ship, adding in various elements described in the Naval Campaign Sourcebook as well. There are myriad ways it could all shake out, but the adventure shies away from lighting one distinct path if that makes sense.
