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Re:Almost 25% of world’s seafloor now mapped by walrus01 on Tuesday October 18, 2022 @12:17AM (#33242918)
> very good maps, very good dead reckoning

There's a whole series of highly classified inertial navigation units used in aviation and submarine applications. The ones for use above the ocean's surface have many DoD applications in a theoretical GPS-jammed environment in warfare against an equal-tech adversary.

Re:Almost 25% of world’s seafloor now mapped by laverya on Tuesday October 18, 2022 @12:49AM (#33243089)
Yeah, I should have said "very good inertial measurement systems" instead of dead reckoning. It doesn't leave quite the same impression!