Statistical processing

Source data

The stock of ships is calculated on the basis of extracts from the Danish Maritime Authority’s ship register (Danish Ship Register, Danish International Ship register and Vessels Register).

All commercial vessels, including fishing vessels, must be registered in either the ship register or vessel register. Vessels that can hold over 20 GT are registered in the Ship Register, while vessels with a gross tonnage below 5 GT are registered in the Vessels Register. For vessels with a gross tonnage between 5 and 20 GT, the owner can choose which register to use.

Additionally, all private vessels over 20 GT must be registered. Private vessels between 5 and 50 GT can be registered voluntarily. All houseboats must be registered in either the Ship Register or the Vessel Register.

Frequency of data collection

Data is collected annually

Data collection

Data are extracted from registers.

Data validation

The ships in the Danish ship registers from the Danish Maritime Authority are cross-checked with previously provided data to identify any missing information and ensure consistency. In particular, the ship's use, year of registration and size may be corrected as needed.

Data compilation

New data is compared with previously published data to ensure maximum temporal consistency, preventing ships from shifting between uses from year to year.

The statistics are limited to cover vessels over 20 GT.

Adjustment

Other corrections are not made in addition to what is described under the items on data validation and data compilation.