Comments by "Mikko Rantalainen" (@MikkoRantalainen) on "Testing the US Military’s Worst Idea" video.

I think you should have used land survey telescopes (or whatever those things are called which are used to measure building foundations using trigonometry and high quality optics). Those would have made it possible to accurately position the helicopter over the target area. Another option might have been high quality cross lasers and sensors in the helicopter. Again, use the stuff certified for building bridges and you should be fine automatically. Cell phone GPS in a partial metal container (helicopter) is not going to be accurate at all. And there exist helicopters with computer stabilized hover which should reduce the pendulum effect a lot. As would shortening the pendulum arm/rope.
1