Acknowledgements
The work performed in this paper was performed in the Vessel TRIAGE project, financed by the Ministry of Foreign Affairs of Finland from the fund for cooperation in the Baltic Sea, Barents and Arctic region. It was coordinated by the Finnish Border Guard, the Finnish Transport Safety Agency and the Finnish Transport Agency in 2014–2015. VTT Technical Research Centre of Finland Ltd served as an external expert in the project. More information on the Vessel TRIAGE method can be found on www.raja.fi/vesseltriage. The authors would like to thank the representatives of the various organizations which have contributed to develop and evaluate the method.