From Statistics Explained Bunkers includes all dutiable
petroleum products loaded aboard a vessel for consumption by
that vessel. International maritime bunkers describe the
quantities of fuel oil delivered to ships of all flags that are
engaged in international navigation. It is the fuel used to
power these ships. International navigation may take place at
sea, on inland lakes and waterways, and in coastal waters.
International maritime bunkers do not include fuel oil
consumption by: - ships engaged in domestic navigation; whether
a vessel is engaged in domestic or international navigation is
determined only by the ship's port of departure and port of
arrival - not by the flag or nationality of the ship; - fishing
vessels; - military forces.