As part of It is Obvious from the Map, Charles Heller and Lorenzo Pezzani (Forensic Oceanography, Watch the Med) do another type of map-making by precisely reconstructing the routes of migrant vessels in the Mediterranean through data collected by multiple tracking systems in a sea that is completely full of sensors. These maps reveal how the suffering of migrants is obsessively watched yet murderously neglected by the various forces tasked with their surveillance and control.