Unit
berthings/day
Count of merchant vessels observed coming alongside per day at the monitored US container gateways. Merchant vessel = AIS ship-type 70-79 (cargo) and 150 m or longer. Without that filter this count is dominated by tugs.
SUPERSEDED. Computed from the crew-set NavigationalStatus field and the old event state machine, both disproven 2026-07-30: the status field recorded 153 anchor events against 3,273 berth events because crews rarely set it, and the state machine split single calls into fragments on speed noise. Replaced by position-based detection in berthing.db — see tt001.gateway.* and berthing/METHOD.md.
· from 1970-01-01 · open-ended · the data is not served while this stands.
Own-recorded live from terrestrial AIS (aisstream.io receiver network); the recording, timestamps and event derivation are ours. Source: undefined.
query_series, describe_series