So the signals from these GPS satellites are not available for public use? Because if they are then I would say it is hard to really say what is the primary use

So the signals from these GPS satellites are not available for public use? Because if they are then I would say it is hard to really say what is the primary use. The value of GPS for civilian use in the US economy is really high at this point. Sort of like the US interstate highway system. Military use got the budget to build it, secondary use ends up being more important.