Quote:
Originally Posted by Mr Quatro
Me either ... the last I heard radar sweeps 360 degrees 
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The problem with radar is that it picks up a lot of stuff. Most of which you may not need to be concerned with, but within that data is the one thing you need to know about.
I may be going out on a limb here, but I think that the vast majority of naval personnel are humans.... and humans make mistakes. That's not an excuse, but perhaps an explanation.