Congestion Methodology
To be counted as congested, a vessel needs to be in an anchorage polygon. There is no minimum requirement for how long a vessel has to be inside an anchorage to be counted as congested.
There are two counts for the Oceanbolt congestion metrics.
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live count - i.e. how many vessels are currently waiting
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daily count - is used to generate a time series of historical counts. The daily count is captured at 00:00 UTC.
Waiting times are calculated from the arrival time at port, but only include vessels that are actually counted as congested.