Harbor Dues : Various local charges against all seagoing vessels entering a harbor, to cover maintenance of channel depths, buoys, lights, etc. all harbors do not necessarily have this charge. (Maritime).
EESiFlo North America, Terminology and Glossary: Maritime Terms, Pennsylvania, USA 2002, flowmeterdirectory.com/flowmeter_terminology. (Mrtm/ Ports and Ships - Amer) {539}
