HI mate the naza will in flight go to the height you want and GPS lock will keep it there, if the wind is strong and quad is tilted over you can flick to ATTI and this will hold the height but you will drift in the wind as GPS is off ,the naza in naza assist you can set height and range as well so even in normal mode the quad will not go over this set height , what about the wii and a blue tooth link ,the problem is when you go into settings a lot of the FCB come out of flight mode into set up mode