Yep. Military, coast guard are both often without AIS. Actually, I think the only times I’ve seen military vessels with AIS on has been during some courtesy vis

Yep. Military, coast guard are both often without AIS. Actually, I think the only times I’ve seen military vessels with AIS on has been during some courtesy visits to other countries. The AIS static data is often not super useful (I think I saw a carrier reporting itself as something like “Uswarship03”). Fishing boats reputedly run without AIS as well to hide their (potentially illegal) activities. Then there are obviously pleasure craft that are not required to have AIS. But at least in the southern Baltic, most seem to carry a transponder.