Notes on marine navigation and weather
Dear David,Can I please use this image for my presentation at the International Marine Conservation Congress?All the best,Ayca
Yes, i would guess you are able to use these, but this is not our decision. Please contact the original sources we list above. thanks for the note.
After some study of the topic of satellite AIS, I might guess that the original source of the picture we show above is not the link we provided above (on which we could not find an actual source), but ultimately the measurements of www.exactearth.com, a Canadian company that does fine work in this area for many years. They would be the ones to contact for latest data of this type... ie historic global ship tracks.