Commercial vessel means any vessel not owned and operated by the United States military or the United States Coast Guard.
Vessel means every description of watercraft, other than a seaplane on the water, used or capable of being used as a means of transportation on water.
tanker in relation to chapter 4 means an oil tanker as defined in MARPOL Annex I, regulation 1 or a chemical tanker or an NLS tanker as defined in MARPOL Annex II, regulation 1.
Pressure vessel means a vessel that may be used for containing, storing, distributing, transferring, distilling, processing or otherwise handling any gas, vapour or liquid under pressure greater than the atmospheric pressure and includes any pipeline fitting or other equipment attached thereto or used in connection therewith; and