The aggregated figures are derived from the fusion of automatic identification system (AIS) information with port mapping intelligence by MarineTraffic (http://marinetraffic.com), covering ships of 1000 GT. Only arrivals have been considered to measure the total number of port calls. To produce any measurement, there must be at least 10 arrivals on a country level per commercial market made by at least 5 distinct vessels as segmented. Missing data could therefore hide small numbers of arrivals that are then also excluded from aggregates.
The aggregated figures are derived from the fusion of automatic identification system (AIS) information with port mapping intelligence by MarineTraffic (http://marinetraffic.com), covering ships of 1000 GT. Only arrivals have been considered to measure the total number of port calls. To produce any measurement, there must be at least 10 arrivals on a country level per commercial market made by at least 5 distinct vessels as segmented. Missing data could therefore hide small numbers of arrivals that are then also excluded from aggregates.
