Abstract: A vessel monitoring service obtains transponder data of a vessel operating within a navigable area. In response to obtaining the transponder data of the vessel, the vessel monitoring service evaluates the transponder data and a plurality of travel segments recorded for a plurality of vessels to identify a travel segment to which the transponder data corresponds. The vessel monitoring service updates the travel segment using the transponder data and determine whether the vessel is engaged in an unauthorized activity. If so, the vessel monitoring service provides an indication that the vessel is engaged in the unauthorized activity.

Abstract: A vessel rendezvous system obtains position data from each vessel of a plurality of vessels operating within a navigable area. Using the position data from each vessel, the vessel rendezvous system determines that a first vessel was engaged in an action with a second vessel within the navigable area. In response to this determination, the vessel rendezvous system provides an indication that the first vessel and the second vessel were engaged in the action within the navigable area.

Abstract: A vessel monitoring service obtains transponder data of a vessel operating within a navigable area. In response to obtaining the transponder data of the vessel, the vessel monitoring service evaluates the transponder data and a plurality of travel segments recorded for a plurality of vessels to identify a travel segment to which the transponder data corresponds. The vessel monitoring service updates the travel segment using the transponder data and determine whether the vessel is engaged in an unauthorized activity. If so, the vessel monitoring service provides an indication that the vessel is engaged in the unauthorized activity.