Hello guys, I own a phantom 2 vision but im having some doubts with the transmitter. I think i understand the different flight modes, attr mode and gps mode but what i cant figure out is in what position does S1 and S2 has to be to select either of the modes, can any one help me out with this one? i would also like to know, is it possible to add a wifi extender (such as the one in the transmitter) below the dji so that it can go further? Thanks a lot !! sorry for the begginer questions!!