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The Americans may have had satellite nav then; the Transit series of 
satellites.  I believe they had to know where they were.  

On Apr 10, 2012, at 9:49 AM, Alexandre E Eremenko wrote:

> 
> 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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