Maritime Operations Data
Vessels at anchor at the world’s major ports — live AIS snapshot
Data as of 2026-07-02 · source: ArcNautical live AIS relay + passive port-call detector (first-party signal, not a third-party aggregate)
1,971 vessels are at anchor across 15 AIS-covered major ports — Rotterdam leads with 794 (40.3% of the anchored fleet); the median completed port stay is 11.9h — snapshot as of 2026-07-02.
| Port | vessels at anchor | % of total | |
|---|---|---|---|
| Rotterdam (NLRTM) | 794 | 40.3% | |
| Tanjung Pelepas (MYTPP) | 390 | 19.8% | |
| Singapore (SGSIN) | 239 | 12.1% | |
| Shenzhen (CNSZX) | 169 | 8.6% | |
| Zeebrugge (BEZEE) | 89 | 4.5% | |
| Busan (KRPUS) | 64 | 3.2% | |
| New York / New Jersey (USNYC) | 55 | 2.8% | |
| Port Said (EGPSD) | 48 | 2.4% | |
| Algeciras (ESALG) | 35 | 1.8% | |
| Los Angeles (USLAX) | 29 | 1.5% | |
| Hamburg (DEHAM) | 28 | 1.4% | |
| Valencia (ESVLC) | 16 | 0.8% | |
| Genoa (ITGOA) | 15 | 0.8% | |
| Guangzhou (CNGUA) | 0 | 0% | |
| Laem Chabang (THLCH) | 0 | 0% | |
| Total | 1,971 | 100% |
Methodology
- Vessels-at-anchor counts vessels reporting speed < 2 kt or AIS navigation status "anchored"/"moored" within 5–25 nm of the port center; at-berth counts the same within 5 nm. Positions come from ArcNautical’s terrestrial AIS receiver network.
- Median stay is the median duration of port calls COMPLETED in the last 7 days from the passive port-call detector — never the elapsed age of still-open calls, which over-counts when a departure is missed.
- Ports outside terrestrial AIS receiver coverage are excluded rather than shown as a false zero: Shanghai, Ningbo-Zhoushan, Qingdao, Tianjin, Xiamen, Port Klang, Kaohsiung, Ho Chi Minh City, Jebel Ali, Jeddah, Santos. A major port with no receivers nearby is a coverage gap, not an empty port.
- At-berth companion count across the same ports: 1,142 vessels.
Source: ArcNautical live AIS relay + passive port-call detector (first-party signal, not a third-party aggregate). Computed by the same ArcNautical engine behind arcnautical.com/check (commit a7911312). Full scoring detail: methodology.
FAQ
Which port has the most ships at anchor right now?
As of 2026-07-02, Rotterdam leads with 794 vessels at anchor — 40.3% of the 1,971 anchored vessels observed across 15 AIS-covered major ports.
How is "vessels at anchor" measured?
From live AIS: vessels reporting speed under 2 knots or an anchored/moored navigation status within 5–25 nautical miles of the port center. Within 5 nm counts as at-berth. Ports without terrestrial AIS receiver coverage are excluded rather than reported as zero.