Ehhhh .... this doesn't seem to be a game breaker to me.
If you witness the jump - let's say sensor lock on the target vessel is enough to determine direction. An Astrogator should be able to plot potential destinations based on the ships jump signature anyway. It may take more time without the analyzer software ... maybe I need another check to search/find the target ships jump rating - but this wouldn't be that hard to do even without the software. I know this is a Jump-X ship ... so where could it be going based on where it is now? I pull up my sector map and I can get potential target hexes pretty quick. An Astrogator plotting the course based on the jump entry should get you pretty darn close (finally a good use case for an astrogation roll!)
At my table this would be a Referee roll. Players wouldn't know until they get there. If they have the software maybe they get a confidence factor, but you don't need specialized software to tell where they are going. Maybe the software does it faster because it can calculate all routes (not sure how as I thought an Astrogator was required to do route calculations) ... but the rest is just detective work.
Game breaker ... not imho. YMMV