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Dear Fred,

Few remarks. 14 days before a missile launch does not seem enough
for advertised accuracy of these missiles.
On a routine voyage this can be enough.

> they probably exceeded what is available publicly today.

What do you mean "publicly". The item to which I posted the link
is advertised as a INS for BALLISTIC MISSILES SUBMARINES.
To you think there are many "in the public" who own those?
:-)

> They also had four units, not a single unit.

Like with chronometers, this does not help with accuracy.
This only helps you to tell that the units show wrong data.
These units do not go off because of some fault in the unit,
but because the error accumulates. It accumulates in all of them,
and averaging will not help here.

To me the most plausible scenario is that the checks were more frequent
and NOT by Cel Nav. Cel Nav depends much on weather, after all.
I am
inclined to think that the possible launch places
were marked somehow with a kind of sound beacons in the bottom.
This looks like the most reasonable solution to me,
short of satellites,
but I have no direct evidence.

Satellites can be used by tethered or disposable receivers on the surface,
which send a sound signal to the sub, and then sink if necessary.

Alex.

   

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