Coastal Traffic Authority · Strait Observatory

Movements by class over time

Monthly stacked area: 5 vessel classes over 24 months. JavaScript renders the chart, the table and the filter links for this panel.

Destinations, ranked

Destinations ranked by movement count, top six ports plus an Other bucket. JavaScript renders the chart, the table and the filter links for this panel.

Speed against draught

Scatter of speed over ground against draught; dragging a rectangle cross-filters every other panel. JavaScript renders the chart, the table and the filter links for this panel.

Speed over ground (kn)

Draught (m)

Speed distribution

Histogram of speed over ground, binned by the Freedman-Diaconis rule (with a Sturges fallback for degenerate samples). JavaScript renders the chart, the table and the filter links for this panel.

When they pass: weekday × hour

Weekday group by six-hour band: five weekday groups, four six-hour bands, each cell shaded by volume with a sparkline of its six hourly counts. JavaScript renders the chart, the table and the filter links for this panel.

Cursor record

Full detail of the hovered or keyboard-focused movement; the tooltip snaps to the nearest record via a 48×48 grid index, never a linear scan.

Hover the scatter, or Tab into it and use the arrow keys.