I have been using Litchi exclusively since June 2017 with my Mavic. I use it mainly for the FPV mode, the waypoint mode, and the panoramic mode, and I have it set to provide verbal telemetry. Technically, I always fly within line of sight, but at distances of more than 400 ft it is difficult to see. I never fly more than 400 ft above ground level, but on a waypoint mission over hilly terrain, I set the altitude for each waypoint. Since the waypoint altitude is in relation to the home point, the max altittude must be changed and the individual waypoint altitudes will appear be more than 400ft - a topography map is required to assure that the waypoint altitude is within 400 ft of waypoint ground level.