double tap and drag. http://www.carlsednaoui.com/post/46803524724/google-maps-one-hand-zoom-on-iphone http://www.carlsednaoui.com/post/46803524724/google-maps-

double tap and drag. http://www.carlsednaoui.com/post/46803524724/google-maps-one-hand-zoom-on-iphone http://www.carlsednaoui.com/post/46803524724/google-maps-one...