abbr. SJ GMU ISSN 2657-5841 (printed) ISSN 2657-6988 (online)DOI: 10.26408
Scientific Journal of Gdynia Maritime University
NavSim Polska sp. z o.o., ul. Różana 95, 59-700 Bolesławiec
Surabaya Sailing Polytechnic, Gunung Anyar Boulevard Street, No.1 Surabaya
University of South-Eastern Norway, Vestfold, Norway
University of Applied Sciences Bremerhaven, Haus T 03-104, An der Karlstadt 8, 27568 Bremerhaven, Germany, Institute of Shipping Economics and Logistics Bremerhaven, e-mail: hschuett@hs-bremerhaven.de