[grey_whiskers]

I am going to assume that you know how many GPS satellites that there are in service and how many reserves that we have. Further I will postulate that you know that China has proven that they can shoot down satellites. Finally, if China is practicing a global fighting war without satellites and the US is not then which country is screwed?

What height was the satellite at which was shot down?

What height do the GPS satellites sit at?

A billion mouths to feed is a liability. All we have to do is take out some of their food & water supplies...

Cheers!

[Eaker]

What height was the satellite at which was shot down?

500 miles.

What height do the GPS satellites sit at?

About 11,000 miles.

However we hit the moon accurately which is much farther away. The key is that even though the satellites are moving they are a "fixed" target in that we know where they will be at any given time.