I'm not sure what you mean by this. "Real-world data show that some high-quality GPS SPS receivers currently attain better than 3 meter horizontal position accuracy" [1], and military GPS is even more accurate.

[1] http://www.pnt.gov/public/faq.shtml#accurate

Umm, that back in the time the missile silos were planned, there was no GPS? That combined with the relatively low-yield warheads meant that hardened silos were a viable weapon - they were likely to survive a first-strike.

Thanks for the downvote tho'.

I thought you were referring to the part where he talked about "modern military GPS."

And I'm not sure why you're so interested in downvotes, but it wasn't me.