>Now why would anyone want to detect ships in a fog? hmmm I wonder.....:)

Oh, if you have a military mind of your own, don't be shy, speak up.

>>But even the history of GPS shows that it took a big civilian tragedy to make such a good thing available to everyone. Before that, it was somehow too good for civilians, eh? Too much information that can't be trusted to normal people? And now anyone can have it - where does that leave the military restrictive logic?
>
>Probably because it had something to do with precision guided system of missiles and anything that it implies?

So? Why was it allowed to the general public and did not remain restricted to military usage?

>There are number of other inventions like anti-bact. chewing gum and microwave-oven.

Microwave oven was invented almost accidentally by a radar engineer (yes, working for a defense contractor) whose chocolate was melting far before its time.

But then microwave oven did have its military use as a fake radar to confuse the missiles. Made a full circle from military byproduct to civilian use to countermilitary use.