you should put your phone in airplane mode this way if somebody calls you it wont disconnect your phone from the RC and you really don't need any downloads coming in while flying also turns off bluetooth . the GPS is in the Spark . you don't need GPS to fly but you need it too RTH and hold steady in heavy winds . as for the maps you need to download maps but you don't need them to fly . you just won't see where you are in the map feature . some of my better quads don't have a map feature because they don't have a phone connected to it , i have been flying them for years . what you need it the pointed arrow to show the direction and heading of your Spark . if your spark is out of site all you have to do is point your stick opposite of the point and it will come back to you . just make sure you are high enugf so you won't hit anything on the way home .