During a large part of the 18th century Dutch envoys in Elseneur kept records of the ships that passed the Danish Sont. Their records were sent to the Hague, where they are now kept in the National Archive. A selection of years from the lists have been entered into a database containing data of over 52.000 records of ship voyages passing the Sont in the 18th century.

Both basic and advanced search are possible. It is also possible to download the entire index as Excel file.