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Fred,

> Just as a side note, one reason the Soviets may have
> been more interested in dip than others is that anomalous dip is more
> common in the Arctic (and Antarctic).

And I assume you have to know the position of your submarine
very exactly, to be able to hit your target with an ICBM :-)
Perhaps this was the reason why Schufeldt report was classified?

Alex.

P.S. I am not sure about early submarine ICBM, but once I visited
an old Minuteman silo in Wyoming (it is open for the public). I was
surprised that the missile
was unguided. It was aimed only at the start by a sophisticated aiming
arrangement, involving a hudge graduated ring... For this you need to know
your launching position
very exactly.

   

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