There is a french company (https://unseenlabs.com/fr/ https://unseenlabs.com/fr/) that specializes in tracking ship at sea through observing their RF emission f

There is a french company (https://unseenlabs.com/fr/ https://unseenlabs.com/fr/) that specializes in tracking ship at sea through observing their RF emission from space. Cool tech. I'm pretty sure their main clients are not all civil...