I live 300 yards from the base of a mountain range that rises about 3000 feet above my home sitting at 6400 feet above sea level. I've flown a couple dozen times with DJI Go 4 for about 6 months around my 12 acre property to get "flight experience and confidence in the Mavic Pro and me". I know my flight altitude limit is 400 ft. above my "Take Off/Launch" Home Position in DJI Go 4. I recently purchased and downloaded Litchi (current version) to my Laptop and my Samsung S9 phone for the ability to plot and load waypoint missions from my PC to my Android Sampsung S9 and DJI controller. I've used Mission Hub to plot some simple Waypoint Missions with little and few elevation changes to test both the software and my confidence in the Litchi program and my Mavic Pro. Will fly a couple of those short, simple missions as soon as it stops snowing and the sun comes out again in the next few days. The assistance, suggestions and guidance I am looking for: Wondering how to eliminate or raise the 400 AGL (Home) limit so I can plot a course up the side of the mountain and back down to my Home location. I plotted a simple mission to fly at least 125' AGL part way up the mountain @10 MPH and return at the same elevation AGL to return Home for the test. Total distance will be about 1/2 mile up and down and not more than a 750' change of elevation for the first test mission and flight. (not interested in hiking up the mountain in 3' of snow to locate drone. I have plotted the course in Mission Hub showing each of the waypoints at 125' with AGL checked. Will this work or am I at risk of it reaching 400' above my Home launch point and then head to the next waypoint at 400' and crash into the mountain. I always err on the side of caution and patience and let others mistakes and knowledge help me. All critiques and suggestions are welcome.