Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
No API key is required; use the AccessAIS tool (marinecadastre.gov/accessais) or the bulk-download site to locate the year/month/zone file you need.
Download the relevant file: pre-2015 data is geodatabase format, 2015+ data is CSV (Zstd-compressed, filtered to one-minute intervals), and 2024-2025 data is also offered as GeoParquet in cloud storage.
Decompress/read the file according to its format (CSV vs GeoParquet vs geodatabase) using standard tooling for that format.
Cross-reference the accompanying documentation/metadata (via InPort) for field definitions, since schemas evolved across the year ranges.
Filter/aggregate the downloaded records locally (by MMSI, vessel type, geographic zone, or date), since this is bulk offline data, not a live query API.
Known gotchas
This is a static/bulk file distribution, not a request-response API - there is no live query endpoint; you must download and process files yourself.
File format changes across years (geodatabase pre-2015, CSV 2015+, GeoParquet for 2024-2025) - a single parser won't handle the full archive.
Files are large and organized by year/zone - plan storage and download bandwidth accordingly, especially for full-coast or multi-year pulls.
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