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Waypoints that move by themselves are theoretically possible, although you would need a ship to follow them anyway. A sensor buoy is stationary and a missile would run out of fuel.
If I want to monitor hostile aliens, I use an ELINT ship (its well worth the 2000 RP), a small scout (fighter-sized, so its hard to detect), a sensor buoy placed on a nearby body, or I try to sneak in a freighter with a tracking station and place it on a body.
Thanks Steve!
I too have several fighter-sized surveillance ships, sensor buoys and DSTSs scattered around the galaxy, to monitor JPs and bodies.
But I'm not satisfied with the ELINT ships that I design: they are always too large, as I wish they can monitor the enemies from afar and with a jump drive.
ELINT modules are fixed at 500 ton large, so it's no easy to fit them even on a FAC.
Can I propose we could have a technology that reduces the size of the ELINT modules? to fit them on small ships, eventually with reduced capacity at reduced sizes.
Maybe, also the cloacking devices could have a technology that reduces their sizes, below the ratio 10% vs. the ship tonnage.
Small ships with ELINT and a cloacking device would be the perfect spies.
In real life, we have fighter-sized electronic warfare planes like EA-6B Prowler, E/A-18G Growler, EF-111, together with large E-3 Sentry, RC-135, EC-130H, E-8 Joint STARS. And we find more small sizes stealth planes, like F-117, F-22, F-35, than large ones (B-2).