On Fri, 19 Dec 2003 19:05:46 GMT, Derek Lyons wrote:
(phil hunt) wrote:

DR is a non-starter--again, you don't just hurl a few
missiles in the general direction of the bad guys and say, "Gee, that was
tough--time for a beer!"

Again, why would DR not work?

Because all navigation system accumulate inaccuracy as time-of-flight
increases.

Well, that's obvious. it's how quickly it accumulates innaccuracy
that matters.

Without periodic updates, you are almost ensured of
failing to hit your target.

Unless you have some other method of terminal guidance.

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