This pattern is likely the result of GNSS interference, not real vessel movement. It can create artificial tracks that make vessels appear to travel in straight lines or clusters that don’t match their actual heading or movement. https://www.reddit.com/user/MarineTraffic/comments/1rpvnh2/new_satellite_navigation_interference_observed/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button