deriving signal
When Data Science Alone Won't Cut it: Deriving Signal from Observations in the Maritime Domain
The article references "anticollision transponders," which is the AIS used by maritime traffic to monitor/track all passenger ships and most cargo. Then there's the bit about "statistical models" which I suppose is some flavor of machine learning to estimate when a transponder is turned off and a vessel is engaged in nefarious activity. How the "notification system alerts authorities when suspected pirate vessels…arrive at ports" if AIS is not active is unclear.