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MengerSponge | on: France's aircraft carrier located in real time by Le Monde through fitness app
And you've defined a harder problem! Once you've found it once it's much easier to find in the future: it can only go so fast, and it's constrained to stay in relatively deep water.
NooneAtAll3 | parent
to be fair "relatively deep water" is 99% of seas and oceans...
bigfatkitten | root | parent
And “only so fast” can be north of 30 knots. The vessel could today be 1000km in any direction from where it was when you found it yesterday.