One week of San Francisco Bay, in motion.

Each bright point is an AIS-equipped vessel. Let the replay run and the faint traces accumulate into the Bay’s working traffic lanes.

—vessels tracked
—positions plotted
Basemap unavailableThe timestamped AIS replay is still shown against its geographic frame.
Preparing 115,417 AIS positions…
Day 1 of 7

About the data

2025-12-08 00:00 UTC → 2025-12-14 23:59 UTC

Positions come from NOAA MarineCadastre / USCG NAIS daily national AIS point files. The seven-day snapshot covers the Golden Gate, San Francisco Bay, the edge of San Pablo Bay, and ocean approaches. Data are public domain (CC0).

NOAA point-data summary 2025 daily AIS files Download standalone HTML

What this view leaves out

  • NAIS uses terrestrial receivers; brief offshore gaps and receiver shadows remain.
  • NOAA downsampled positions to roughly one report per minute per vessel.
  • Small craft without AIS are invisible. MMSIs and vessel types are self-reported.
  • A 50 m movement filter makes lanes clear but anchored vessels sparse.
  • The weekend is included, increasing pleasure and sailing traffic versus a pure workweek.
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