NavList:

Alex, you wrote:
" Among other things, he tells us the accuracy of
inertial systems, the subject which was intensively
discussed once on this list. I mean how long could a 1960 submarine stay
submerged before it lost its position."

Well, he doesn't "tell us" anything. All we have here is a PDF version of a series of PowerPoint slides with a single line: "Inertial Navigation Systems (integration drift of 0.6nm / hour)". There's no way to be sure what he was actually saying while this particular slide was on the screen. That number may refer to a particular system historically, or it may refer to the cheapest systems available today, or it may merely refer to "hearsay". There's no reason to suppose that this author has any expertise at all in inertial systems.

-FER
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