Federation Probes and Space Vehicles Database
Communications Beacon U.S.S. Voyager
|Until permanent subspace relays are available in unexplored areas of the galaxy, small expendable beacons are carried aboard Federation
starships as temporary devices until full fledged units can be placed. The extended exploration and patrol range of Starfleet vessels is so great that over 500 new subspace
relays are made operational each year.
Star Trek: The Next Generation Technical Manual
VOY "The Fight"