I'm gaining confidence in the Litchi app to run my P3. Today I had a chance to run it through it's paces over open desert with low wind. It is very cool to just trace out a flight path against a map and have it go. Next tests are in the mountains. There are a lot of unknowns with altitude gain and loss with flight time and time between waypoints.
Here is the video of the tests:
Here is the video of the tests: