I have a 13-waypoint route saved as a Favorite for a Phantom 3 Standard.  I just need to change the location (i.e., lat/lon) of one of the waypoints.  Is there a file (either on my iPhone or on the Phantom) that I can access to adjust the location of the waypoint, or must I re-fly the entire route and re-record all 13 waypoints?  Many thanks for your help

You'll need to re-fly the entire route and re-record all the waypoints.

Or you need to use Litchi or Autopilot because they let you edit your waypoints.