I'm not sure but I think the AAI Mods (Programmable Structures, AAI Signals, AAI Zones?) have detector buildings that output coordinates.
It's a bit dangerous since a lot of wiring would be required and a small error could cause a nuclear strike in the middle of your base.
Automated target designation is the next big thing on my todo list for this mod.
I'm just not certain how to implement it. The search algorithm is not very performant and I don't want my mod to have a bad impact on the framerate or cause stuttering. The only solution I have until now would be to save all biter nests to an array and update it each time a new one is build or destroyed... Not perfect either...