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- Ports in the portal are based upon the Global Fishing Watch anchorages dataset, a global database of anchorage locations where vessels congregate. The dataset contains over 160,000 individual anchorage locations, which are further grouped into nearly 32,000 ports. A vessel is considered to have visited a port when within three kilometers of an anchorage location and has stopped (speed of less than 0.2 knots). The vessel may subsequently exit the port when it travels more than four kilometers from the anchorage. Global Fishing Watch restricted port visit durations to a minimum of three hours, but imposed no maximum, so some visits extended for multiple weeks. For further details click here.
- Port visits of less than three hours may be caused by false transmissions or may represent intermediate anchorages where a vessel waits before entering the main port and conducting operations, such as offloading of catch.