[nocsi]

Reminds me of Pokémon Go spoofers. It falls to having to trust that the client is truthfully reporting. You could probably improve the AIS system and do the whole Apple Find My network crowdsource thing - letting ships triangulate one another. But you’re still trusting signals that can be spoofed

[lathiat]

You can and people already do receive AIS with satellites. So that’s mostly possible without it being peer to peer. AIS only makes it about 50 miles across the ocean due to earth curvature so in sparsely populated areas a peer to peer approach probably won’t tell you too much.