In answer to your question:Well, like I said in another thread a Mavic with full battery could possible flyaway 5-10 miles so it makes the MP not much use in a real world 'Murphy's Law' environment. Can't expect your Drone to stay within the 2 mile limit of the MP's range. That and the price led me down the GPS Tracker road. Personally not interested in a MP but glad it works for you. Would be interesting to hear from someone who's Drone flew beyond the MP range and how it turned out.
I have flown beyond the Marco Polo range.
If it did go down, in that case it is an easy task to go in the direction that it was flying to obtain a lock again.
On my test in Russia, at first I had no lock due to mountains, but after I traveled in the direction of flight, I got the signal back.
With GPS or cell towers in rough areas it is difficult to obtain enough satellites or will have no cell connection in many places I go.
My home is in Japan, and even with their high end tech all over the country, I still find myself with no GPS or cell service in valleys etc. (where much of the best scenery is found...waterfalls, etc.). So I fly in Atti to get my shots (as I flew RC helicopters for years before GPS).
When all tech goes down, the basics prevail.
But my hope is that someone can come up with something better, something reliable, something simple. Maybe it’s your system.
Maybe it could have multiple technologies: GPS, Cell, and a direct MP type system built together that adds redundancy and accuracy.
After spending as much as I have on all my flying platforms, I would certainly pay for such a system.
If you do develop your system, I would love to try it out. I go to many places in the world, in every environment. Best to you.