A power-driven vessel is any vessel propelled by machinery.
A sailing vessel is any vessel under sail, provided that propelling machinery, if fitted, is not being used.
A fishing vessel is any vessel used for catching fish, whales, seals, walrus or other living resources of the sea, including any vessel used to transfer the catch of another vessel to shore.
A vessel engaged in fishing is any vessel fishing with nets, lines, trawls or other fishing apparatus which restrict manoeuvrability, but does not include a vessel fishing with trolling lines or other fishing apparatus which do not restrict manoeuvrability.
A restricted vessel is any vessel unable to keep out of the way of another vessel because it is engaged in work restricting its ability to manoeuvre as required by the Collision Regulations or any vessel constrained by a channel.
A vessel not under command is any vessel, which through unusual circumstances is unable to manoeuvre as required by the Collision Regulations, and so is unable to keep out of the way of another vessel.