There is heavy reliance on GPS for precision timing to make cellular radios work (why spend $100k on an atomic clock, when a $500 GPS unit will do). A few other

There is heavy reliance on GPS for precision timing to make cellular radios work (why spend $100k on an atomic clock, when a $500 GPS unit will do). A few other things are starting to take a dependency on GPS (power grid, TV). Good roads can be hard to come by in quite a few areas. Even if a area has a road big enough to support a truck, they can be impassable during the rainy season.