re: “I just wonder without GPS how they will position the battery?”
Terrain map on CD; you don’t need GPS with that in hand ... (BUT your laptop will have to work. Alternatively, a 7 1/2 minute paper “topo” map will work.)
Also, carry an aneroid barometer, used in conjunction with topo map.
Oh, you’ll need a pair of function eyeballs to locate land features correlated to the topo map.
So how close in accuracy can you get with a map and what a compass?
Of course as a young devil dog I didn’t care to ask too many questions but as I age I am more curious as to the details. Heck a few weeks ago I spent a night trying to find out how they emplace 81mm mortars, and damn there was scant info beyond aiming stakes and stuff.