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If you're a rogue state actor it doesn't cost much to bribe a dodgy captain of a dodgy ship to accidentally drag their ships anchor over a cable.

Worst case the ship gets impounded and the crew arrested - but still a good chance of a govt turning a blind eye as dealing with the political fallout is often more inconvenient.

Here's a map showing radar coverage: https://www.researchgate.net/publication/369794025/figure/fi...

There are more radars there, that's not everything. But until recently, what reason was there to pay for complete coverage?

There's also satellite footage available from commercial companies. Ships can only move so fast so even hourly footage narrows down very quickly.

If there wasn't already a company offering this as a geo-feed I'd be very surprised.

When coding, you trust the CPU to do correct math. The kernel to properly allocate memory. The network stack to send packets and pass you only the ones with valid checksum.

Much of our world operates on trust (and eventually verify), same as any application does. It's exceedingly costly to do otherwise.