In short, 72–76% of the world’s industrial fishing, and 21–30% of transport and energy, vessel activity are missing from public tracking systems.
The actual article from Nature, in open access: <a href="https://www.nature.com/articles/s41586-023-06825-8" rel="nofollow">https://www.nature.com/articles/s41586-023-06825-8</a>