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Danish Maritime Authority AIS Data

Historical AIS positions for Danish waters as daily zipped CSV files from the Danish Maritime Authority, free to download.

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About

The Danish Maritime Authority owns and operates the shore-based AIS stations along the Danish coasts, an obligation under Directive 2002/59/EC. Besides a here-and-now traffic picture, the system stores AIS data to reconstruct accidents and to analyse traffic patterns, and the authority publishes that history as zipped CSV files on an open file index, one archive per day. Each row carries the base-station timestamp, mobile type, MMSI, position, navigational status, motion fields, and the static data a ship reports.

Through Fibric, an operator loads the days you name, filters to a strait, a port, or an MMSI, and proposes findings, plans, or incident notes for your approval, with the source file names attached.

This is a reference listing. It documents what Fibric would read from Danish Maritime Authority AIS Data and what it could propose, based on the publisher's published interfaces. Fibric builds it under a managed deployment when you request it; selecting it here installs nothing.

Inputs

  • Daily archives named aisdk-YYYY-MM-DD.zip on aisdata.ais.dk, with monthly aisdk-YYYY-MM.zip archives for earlier years back to 2006
  • Per-message rows: Timestamp from the AIS base station, Type of mobile (Class A, Class B, and others), MMSI, Latitude, and Longitude
  • Navigational status, ROT, SOG, COG, and Heading from each AIS message when available
  • Static and voyage fields: IMO, Callsign, Name, Ship type, Cargo type, Width, Length, Type of position fixing device, Draught, Destination, and ETA
  • Data source type and the antenna offsets Size A, B, C, and D, as documented in the README on the file index

Proposed actions

Read-only. This feed informs operators; it changes nothing.

Proposed actions are target capabilities. Every action runs propose-first and needs a validated deployment and the appropriate permissions.

What you can build

  • Reconstruct a near-miss or grounding

    Given a date and an area, the operator pulls that day's archive, isolates the vessels involved by MMSI, and drafts an incident timeline with positions, speed, and heading for you to review before it is filed.

    With Root Cause, Incident Draft

  • Plan berth demand from traffic history

    The operator counts arrivals by Ship type and Destination across the months you choose and proposes a berth plan and staffing outlook for your approval, with the source days listed.

    With Demand Outlook, Dock Schedule

  • Benchmark traffic on a passage line

    For a passage line or transit route, the operator computes daily vessel counts and speeds by type and proposes the comparison periods and thresholds, which you approve before anything is published.

    With Site Benchmark

Requirements

  • Software that unpacks the zip archives and parses large CSV files; the authority notes a special application is needed to present the data
  • Storage and bandwidth for daily archives that the file index lists at hundreds of megabytes each
  • Handling of comma decimal separators in coordinates, as the README example shows (57,8794)
  • Compliance with the authority's condition that data not be combined to identify persons without a permit from the Danish Data Protection Agency
Authentication
None. The historical archives download from aisdata.ais.dk without an account or key.

Limits

  • Historical files only; web access to online AIS data and the online raw data flow are paid subscriptions under the AIS data management policy
  • The authority does not guarantee the correctness of AIS data and accepts no liability; errors entered on board pass through
  • The authority may change the updating frequency, coverage, or nature of the data flow at any time without notice
  • Coverage is the reach of the Danish shore-based stations, not worldwide

Access and pricing

Reference listing. Public feed access is separate from Fibric integration. If you request this feed, your quote covers the build, usage, and support.

Request Danish Maritime Authority AIS Data ↗

Questions and answers

How far back does the archive go, and how fresh is it?
The file index lists monthly archives from 2006 and daily archives in recent years, and the authority describes the historical data as continuously updated. Its policy states AIS data stays in the real-time system for up to 24 months, after which it is packed and made available as open data for a limited period.
What is in each CSV row?
The README lists 26 columns: Timestamp, Type of mobile, MMSI, Latitude, Longitude, Navigational status, ROT, SOG, COG, Heading, IMO, Callsign, Name, Ship type, Cargo type, Width, Length, Type of position fixing device, Draught, Destination, ETA, Data source type, and Size A, B, C, and D.
Can I get a real-time feed from this source?
Not from the free archive. Web access to online AIS data and the online raw AIS data flow (proxy access) are paid for by an annual subscriber fee under the AIS data management policy, which grants access on the basis of the Danish PSI act.
Ask about Danish Maritime Authority AIS Data

Ask about the capabilities and requirements in this listing.

For project-specific requirements, contact Fibric.

This Commons signal listing is developed, published, and supported by Fibric. It reads public data published by Danish Maritime Authority (aisdata.ais.dk). Upstream agencies and projects are the property of their respective owners, who are not affiliated with Fibric and do not sponsor or endorse this listing. Trademark policy