Vessel
Every description of water craft, including non-displacement craft WIG craft and seaplanes, used or capable of being used as a means of transportation on water.**Can. Mod.: For the purpose of these rules, the definition of the word "vessel" does not apply.
Power-driven vessel
Any vessel propelled by machinery.
Sailing vessel
Any vessel under sail provided that propelling machinery, if fitted, is not being used.
Vessel engaged in fishing
Any vessel fishing with nets, lines, trawls, or other fishing apparatus that restricts manoeuvrability, but does not include a vessel fishing with trolling lines or other fishing apparatus which do not restrict manoeuvrability.
Seaplane
Any aircraft designed to maneuver on the water.
Vessel not under command
A vessel which through some exceptional circumstance is unable to manoeuvre as required by these Rules and is therefore unable to keep out of the way of another vessel.
Vessel restricted in her ability to manoeuvre
A vessel which from the nature of her work is restricted in her ability to manoeuvre as required by these Rules and is therefore unable to keep out of the way of another vessel.
Types of RAM vessels
-laying, servicing or picking up a navigational mark, submarine cable or pipeline-dredging, surveying or underwater operations-replenishment or transferring persons, provisions or cargo while underway-launching or recovering aircraft-mineclearance operations-towing operations such as severely restricts the towing vessel and her tow in their ability to deviate from their course
Vessel constrained by her draught
A power-driven vessel that, because of the vessel's draught in relation to the available depth and width of navigable water, is severely restricted in the vessel's ability to deviate from the course the vessel is following.
Underway
A vessel that is not at anchor, or made fast to the shore, or aground.
Length and breadth
Length overall and greatest breadth.
Vessels in sight of one another
When one can be observed visually from the other.
Restricted visibility
Any condition in which visibility is restricted by fog, mist, falling snow, heavy rainstorms, sandstorms, or any other similar causes.
Wing-in-Ground (WIG) craft
A multimodal craft which, in its main operational mode, flies in close proximity to the surface by utilizing surface-effect action.