Essentially a vanity item. It’s a temporary beacon structure that when placed emits a pulse of light every several seconds, and around it is a constant radio buzz indicative of military operations, with callsigns, various voices and other indicators. It’s very useful for fleets - fleet beacons are invisible and can not be scanned down in-system. When in a fleet and placed by the fleet commander (or any of her lieutenants) they are visible for the entire fleets and can serve as lock points for jumping. In the overview they have a distinctive color and they pulse. On grid (within several hundred kilometers) they are invisible for everyone, and can be destroyed.
The primary function of these devices is that they regulate arrival for the fleet in two ways
(1) any fleet that warps in arrives exactly at the same moment, using a unique triglavian subspace conduit recallibration equillobrator array, compensating for slow warp vessels as well as TiDi warp interference disruption ripples.
(2) the fleet command can pre-determine any of several a landing patterns. The fleet lands in a specified grid pattern, with types of ships arrayed as desired, in a spherical pattern around the Fleet Beacon, which size depends on some specified skill of the fleet commander (say, 50 kilometers plus 25 per skill level).