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The Danish Maritime Authority makes the following data sets, AIS density plots and navigation warnings available for use in a wider context.
Read 'Conditions for the use of data' so that you are aware of the conditions and terms.

Overview with data sets and AIS Density Plots

Data sets

Anchorages, regatta lanes and ships' routes are available as WMS services and via the Danish Maritime Authority's data collection on ArcGIS Online.

Information and meta data concerning data sets

AIS Density Plots

AIS Density Plots have been made for selected types of AIS data, namely the following types: fishing vessels, passenger ships and tankers. Density Plots have also been made for 'all types of ships'.
AIS Density Plots are available as WMS services and via the data collection of the Danish Maritime Authority on ArcGIS Online.

Information and meta data concerning AIS Density Plots

Notices to Mariners, Navigational warnings and Firing warnings

Notices to Mariners (NtM), Navigational and Firing warnings can be obtained by REST call to the Danish Maritime Authority's "Niord" service. The data model and the REST API are described at:

Documentation on Niord REST API

Examples:

Active Navigational warnings and Notices to Mariners in Danish and English

Active Notices to Mariners in Danish