“The yacht’s navigational equipment was pretty ‘vanilla,’ Schofield assured him, a representative sample of the sort of equipment used across the industry.”
A superyacht runs on the same off-the-shelf navigation gear as half the ocean, and it will believe whatever GPS signal you feed it. Spoofing it is cheap and easy because nobody bolted on real security. The rich built floating palaces on top of consumer-grade electronics. The same trick works on the cargo ships moving the entire world economy.