Unit
hours
Anchor time counted ONLY where a berth followed in the same visit. Ships also anchor for bunkers, stores, crew changes, weather and awaiting orders; none of that is queueing.
STATUS: WITHDRAWN · SINCE 1970-01 · RETURNS WHEN THE CONDITION BELOW IS MET
RIGHT-CENSORED AND THIN. 44 of 206 calls anchored but had not berthed when the window closed, and those are the LONGEST waits, so the bias grows exactly when congestion is worst — in a crisis this would sag rather than spike. Only 92 of 1,241 observed anchor hours (7%) are verified as queueing. Usable once the archive exceeds the waits it measures. We will not serve data we cannot stand behind, so this page stays up but the numbers do not.
More on the practice: withdrawn data.
We watched it happen: our own AIS receivers (via the aisstream.io terrestrial network), our timestamps, our archive.
This address is permanent. If this figure is revised or corrected, the change is printed here with its size.
query_series, describe_series