Add a radar dish.
Add a radar dish and make it work with the console block. It could show a sphere and everything within the set range will show its location in 3D. 5-10km would be a fair max distance. You could then select any target for a more detailed look at it to show how heavily armed it is or any other info about it. It could work as an early warning system for ground bases if combined with lights and sirens. You could also set it to only warn for certain factions or assign them different warnings so you know if it's friendly or not.