Funny thing...we were experimenting with this yesterday at the lake. It was 700' across the lake to the cliffs we were playing along. Could clearly see the Phantom 4's but if looked down at the monitor was almost impossible to visually find the drone again. At 2,500' impossible even if tracked it visual the whole time...blue sky, black mountains or water backdrops...impossible for us to see them. Oh to be young and have those bionic eyes.....
[/QUOTe
can't take your eyes off the drone , if you do you'll lose sight of it even at short distances . 700' is nothing a romp inn the park . 2500 tough with the wrong sky and back drop . but not impossible. same with a mile away .train your eyes and don't take them off the drone . i can see birds from well over a mile and drone is not much different . those that say it can't be done are just blind