Colregs Rule 3 - General definitions | Collision regulations at sea | ROR | Rules of the road

Colregs Rule 3 - General definitions | Collision regulations at sea | ROR | Rules of the road

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Rule 3 – General Definitions
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For the purpose of these Rules except where the context otherwise requires:

a. The world “vessel” includes every description of watercraft including non-displacement craft, WIG craft and seaplanes used or capable of being used as a means of transportation on water.

b. The term “power-driven vessel” means any vessel propelled by machinery.

c. The term “sailing vessel” means any vessel under sail provides that propelling machinery if fitted, is not being used.

d. The term “vessel engaged in fishing” means 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.

e. The word “seaplane” includes any aircraft designed to manoeuvre on the water.

f. The term “vessel not under command” means a vessel which through some exceptional circumstances is unable to manoeuvre as required by these Rules and is, therefore, unable to keep out of the way of another vessel.

g. The term “vessel restricted in her ability to manoeuvre” means 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.

The following are the vessels as declared under these Rules to be ‘vessels restricted in their ability to manoeuvre’, however this list is not absolute and final, this is a general guidance for such vessel, any vessel other than those in the list may also be ‘vessels restricted in their ability to manoeuvre’.

The term “vessels restricted in their ability to manoeuvre” shall include but not limited to:-

a vessel engaged in laying, servicing or picking up a navigational mark, submarine cable or pipeline;
A vessel engaged in dredging, surveying or underwater operations;
A vessel engaged in replenishment or transferring persons, provisions or cargo while underway;
A vessel engaged in the launching or recovery of aircraft;
A vessel engaged in mine clearance operations;
A vessel engaged in a towing operation such as severely restricts the towing vessel and her tow in their ability to deviate from their course.
Related Article: Rule 7 - Risk of collision
The term “vessels restricted in their ability to manoeuvre” shall include but not limited to:

Meaning: ‘shall include but not limited to’, this means that the Rules define the following vessels as being restricted in their ability to manoeuvre, but the classification of ships is not limited to the vessels already described, other vessels may also be included if they are also restricted in their ability to manoeuvre.

h. The term “vessel constrained by her draught” means a power-driven vessel, which, because of her draught in relation to the available depth and width of navigable water, is severely restricted in her ability to deviate from the course she is following.

If the channel or bay is such that all over the bay the depth is as mentioned but the size of the bay is 30NM by 40NM then she would not be a ‘vessel constrained by her draught’.

i. The word “underway” means that a vessel is not at anchor, or made fast to the shore, or aground.

Related Article: Rule 27 - Vessels N.U.C or R.A.M
If the vessel drags her anchor and moves away then too she is not at anchor.

Thus the meaning of ‘at anchor’ means in relation to the ‘made fast to shore’ and ‘aground’ that is the ship cannot move or drift away.

j. The words “length” and “breadth” of a vessel means her overall length and her greatest breadth.

Meaning: Here LBP does not mean the length.

k. Vessels shall be deemed to be in sight of one another only when one can be observed visually from the other.

l. The term “restricted visibility” means any condition in which visibility is restricted by fog, mist, falling snow, heavy rainstorms, sandstorms or any other similar causes.

m. The term “Wing-In-Ground (WIG) craft” means a multimodal craft which, in its main operational mode, flies in close proximity to the surface by utilising surface-effect action.

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