Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/4821002
Is Reference of Problem area for marine navigation-en#Sense
Zone critique pour la navigation-fr#Sense
Problem area for marine traffic-en#Sense
Problemgebiet im Seeverkehr-de#Sense
Zone critique pour le trafic maritime-fr#Sense