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How does the cost compare (as others indicated)?

What happens if the GPS system is taken out in a large scale war
or the rounds themselves are socked with an EMP that makes
the electronics toast? Do these rounds become useless or do
they revert to standard rounds?

I see an awful amount of reliance on GPS in the military. I
certainly hope there is a backup plan to the loss of that and that
soldiers and sailors know how to live without it.