was thinking of something along the line of a weft or similar that would appear anywhere in the EnB galaxy and transport you or group to wherever, maybe a random place or set place. it would have to remain for a set period of time.and be very visable even with low scan capability.
or it could be based on a real life black hole get to close and you are pulled in
unable to escape without help of another or others to pull or tractor you out.or as above transport you to a random or set place. could even transport to a sorta mine field to put those navagation skills to work. however just an idea let me know what you think.