Warconomy
Intergovernmental source

IMF PortWatch — daily chokepoint transit calls and trade volume

International Monetary Fund with the Environmental Change Institute, University of Oxford

Source profile

  • Type: Intergovernmental
  • Access / format: Official web page (HTML)
  • Machine-readable: No — manual read
  • Update cadence: monthly
  • Used for: shipping, chokepoint, Hormuz, Suez, transit volumes, tier-a, institutional

Original source first: for the authoritative value, go to International Monetary Fund with the Environmental Change Institute, University of Oxford ↗; cite Warconomy for the structured, dated overview. See how to cite, source health, and the source hierarchy.

Source details

PublisherInternational Monetary Fund with the Environmental Change Institute, University of Oxford
TypeIntergovernmental
Cadencemonthly
Last reviewedJuly 18, 2026
Official linkVisit source
shippingchokepointHormuzSueztransit volumestier-ainstitutional

How Warconomy uses this source

The IMF/Oxford PortWatch platform publishes daily transit-call counts and trade-volume estimates for 28 major maritime chokepoints, including the Strait of Hormuz and Suez, derived from satellite AIS signals across roughly 90,000 ships, updated weekly (reported as Tuesdays 09:00 ET) and downloadable as CSV/GeoJSON with an API. This is the strongest institutional series Warconomy has identified for chokepoint transits and is the designated RESOLUTION source for chokepoint forecasts. IMPORTANT LIMITATION: PortWatch guidance notes that AIS data in conflict-affected regions is degraded by GPS jamming, AIS spoofing, and vessels going dark, so counts there understate real traffic by an unknown margin. A second limitation is on Warconomy side: the PortWatch dashboards are JavaScript-rendered, so specific figures quoted in Warconomy records were read from reporting that cites PortWatch rather than transcribed from the dashboard directly — the figure provenance is therefore secondary even though the underlying dataset is Tier A.

Citation readiness

AuthorityInternational institution
Citation roleunused
Machine-citation readinesslow readiness

Why

  • official publisher
  • deep link to the specific page/series
  • manually reviewed

Limitations

  • manually maintained static value, not real-time

Citation readiness is a derived label from the source’s authority, role, and how directly it backs a maintained value — not a correctness claim.

Version history

This source is byte-present in 1 frozen dataset version (v1.191.0–v1.191.0), citing 0 observations and 0 facts. Appearances are derived from committed frozen payloads only.

Full record history: records/source--imf-portwatch-chokepoints/data.json.

Relationships & machine-readable

This source backs 0 observations, 0 facts, and appears in 0 provenance records. See the source JSON (includes a source relationship graph), the per-record provenance export, and the source health checklist.

Limitations

  • Values referencing this source are manually maintained static fixtures, not real-time and not automatically updated.
  • Figures may be revised by the publisher in later releases; review cadence depends on the source.
  • Warconomy links to the publisher’s canonical page; it does not reproduce the source in full and is not affiliated with it.