Well Bill, you really need to do some real researching yourself, you wrote of wearing the a "pre-electronic calculator" on your belt, a slide rule, so I would have assumed that you would have done some deep-dive research, rather than just casting questions out onto the universe.
So to start you off, here is a link to the User Manual for the
Mini 4 Pro…
Learn and download DJI
Mini 4 Pro related apps, software, and manuals at the DJI Download Center
www.dji.com
Next, remember, YouTube is your friend, a friend that will tell you all you want to know and it will also "pull your leg" with Bull-Chips with outrageous stores, some true, most not…
Next, since you are not being very open about your location "Planet Earth", you make it difficult to answer your questions. DJI advertises the maximum range of the DJI
Mini 4 Pro drone at approximately 18 kilometers (11.18 miles). And that is under ideal conditions, but what are Ideal condition, not urban (too many buildings and transmissions), not suburban (too many trees, houses, utility poles, transmission, etc…), and certainly not most rural (if there is one tree, it will interfere and weaken the signal…), and if you choose to go to the A "wilderness" (the trees are full of water and it does not take many trees to weaken the signal and shorten the range…)
If you really want to find the max range, you need a raft and travel o "Point Nemo" the most remote location on Earth (you know where Earth is, right? L o L . . . ). Nemo is also known as the Oceanic Pole of Inaccessibility, since it is located in the Pacific Ocean, 2,688 kilometers or 1,450 nautical miles from any land…
However, you only need to watch for space debris falling on your head as it is the target for most decommissioned satellites to be dumped to minimize the possibility of striking anything… especially someone in a rubber raft with a drone…
At least, there are no geo fences for thousands of miles of Nemo…
Finally, the
Mini 4 weighs less than 250-grams with the small battery and is not required to be registered with the FAA if you are flying Recreationally.