Search results for: What is AIS

Transshipment Data and Report

Today we published our initial research on transshipment at sea. Transshipment at sea is where a fishing vessel offloads its catch to a refrigerated cargo vessel (or “reefer”) far from port. You can download a copy of our report via this link. The image above was created by our data scientist Nate Miller, who has spent […]

vessel Krabbenkutter

Beyond the Horizon

Most of the oceans are over the horizon and under the waves. As a result, the ocean is incredibly difficult to monitor. With regards to fishing, most of our data on where and when fishing occurs comes from data collected at port or through the logs of

Bjorn Bergman

Bjorn Bergman Data Analyst Shepherdstown, WV Bjorn Bergman works to systematically detect false automatic identification system (AIS) vessel tracking positions and to characterize specific patterns associated with intentional data manipulation and data errors resulting from third party interference in the GPS system. Bjorn has worked on many aspects of Global Fishing Watch since its inception, […]

I downloaded data from the Global Fishing Watch platform or public APIs before 1 August 2024, and when I downloaded the same data now, it has changed. Is this expected?

Yes, this is expected. Global Fishing Watch are actively working to improve data reproducibility. Because we ingest new satellite data daily, we constantly update our information. This means that what we previously identified as the end of a voyage or a vessel slowing down could now be part of a continuous voyage or a fishing […]

How do I compare data outputs from previous data updates to the latest data?

As of January 28, 2025, the latest AIS data version is v3 (details about v3 are available here). The previous version, v20231026, has been deprecated. While originally scheduled for deprecation in February 2025, this was accelerated due to low usage and high maintenance costs. Please note that comparing data outputs between v20231026 and v3 is […]

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