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What are loitering events in the carrier vessel portal?

What are loitering events in the carrier vessel portal?
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    • Loitering is when a single vessel exhibits behavior indicative of a potential encounter event. Loitering is also estimated using AIS data, including vessel speed, duration in a given location, and distance from shore. 
    • Loitering occurs when a carrier vessel travels at average speed of < 2 knots, while at least an average of 20 nautical miles from shore. 
    • It is possible that loitering events do not indicate a potential transshipment, but another event in which a vessel may remain fairly steady, including maintenance or waiting outside of port for permission to dock
    • Due to the individual definitions of loitering events and encounter events, it is possible for a loitering event to overlap with encounter events and to encompass one or more encounter events. 

For both encounters and loitering events the duration can be filtered between 1 hour and greater than 48 hours based on user preference. This filter can enable a user to restrict possible transshipment events to those they consider more likely based on knowledge of duration of transshipment events.

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