Farm tech...
"Your correspondent's knowledge of farming is sketchy at best, mostly being drawn from the ill-informed BBC Countryfile programme, but this seems like a solution to a problem that thousands of years of human evolution and progress has already solved."
In the UK I would say you are dead right, in Aus though, where some of the farms are as big as Wales, and use helicopters to do their cattle controls, I can imagine it would be majorly useful. Although I cant imagine how you could keep it cheap? Especially since those farms tend to have 10's of thousands of head of cattle. That's a hell of a lot of transmitters, and a heck of a lot of data moving over the satellite...