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to be fair "relatively deep water" is 99% of seas and oceans...

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.

Yes, but if you know the general direction of where it's going that reduces the search area quite a bit.

In this case, for example, the French Government publicly announced where it's going.

"Our next-generation AI uses multi-sensor fusion and live sentiment analysis to track military assets to meter-scale accuracy anywhere in the world"

"Upon closer inspection, the neural network is just scraping public information from the French Ministry of Defense"