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INTERNATIONAL RULES FOR PREVENTING COLLISIONS AT SEA - PART C RULES 20 - 31
2008
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General Instruction in the various navigation light layouts that may be experienced. In all examples define what action you would take if the grey mast indicates your vessel’s bow, and the other vessel is on a steady bearing.
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Rule 20 - Application
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Rule 20 - Application Lights shall exhibited from sunset to sunrise, and no other lights shall be exhibited that may be confused with the defined lights. Navigation lights shall also be exhibited during periods of restricted visibility
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Rule 21 - Definitions
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Navigation Lights 1. Masthead light 2. Port side light 3. Starboard side light 4. Stern light 5. Towing light
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Rule 22 - Visibility of Lights
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Rule 22 - Visibility of Lights
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Rule 23 - Power-driven Vessels Underway
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Power driven vessel, less than 50m in length, underway and making way, seen from starboard
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Power driven vessel probably greater than 50 metres in length, seen from ahead.
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Power driven vessel probably greater than 50 metres in length, starboard side open
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Power driven vessel maybe more than 50 metres in length, port side open
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Power driven vessel maybe more than 50 metres in length, port side open
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Submarine, underway and making way, seen from starboard (Yellow all round light 90 flashes per minute)
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Submarine underway and making way, port side open (Yellow all round light 90 flashes per minute)
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Non displacement vessel making way, port side open (Yellow all round light 120 flashes per minute)
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Non displacement vessel possibly greater than 50 m in length, underway and making way, port side open (120 flashes per minute)
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Rule 24 - Towing and Pushing
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Towing vessel 50m or less, with length of tow 200m or less, seen from ahead. Tow too small to be seen from this aspect.
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Tug with tow less than 200m, starboard side open
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Vessel less than 50 metres in length engaged in towing, with length of tow less than 200 metres seen from port
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Vessel less than 50 metres in length engaged in towing, with length of tow less than 200 metres seen from port
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Vessel engaged in towing less than 50m in length, with length of tow greater than 200m, starboard side open
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Vessel engaged in towing possibly greater than 50m in length, with length of tow less than 200m, starboard side open
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Tug with tow less than 200m, port side open
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Vessel engaged in towing, with tow, seen from aft
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Vessel engaged in towing, with tow, seen from aft
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Tug with tow less than 200m, starboard side open, pushing but not composite unit
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Tug with tow exceeding 200 metres, starboard side open, towing a log boom
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Vessel engaged in towing, probably a log boom, seen from astern
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Vessel engaged in towing possibly greater than 50m in length, with length of tow greater than 200m, starboard side open
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Vessel engaged in towing, seen from astern, and the tow seen from starboard
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You could be in risk of collision, and in grave danger
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Rule 25 – Sailing Vessels Underway and Vessels Under Oars
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Sailing vessel, port side open, showing optional lights
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Sailing vessel seen from ahead
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Sailing vessel less than 20 metres in length seen from ahead, with combined lantern at masthead
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Sailing Vessel from astern
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Sailing vessel with mast head lantern, seen from starboard
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Rule 26 - Fishing Vessels
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Fishing vessel engaged in fishing under 50 metres in length, starboard side open
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Fishing vessel engaged in trawling, underway less than 50 metres in length, port side open
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Fishing vessel less than 50m in length, engaged in fishing, seen from starboard
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Fishing vessel engaged in fishing under 50 metres in length, port side open
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Vessel engaged in trawling, underway maybe 50 metres or more than in length, seen from ahead
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Vessel engaged in trawling, underway maybe 50 metres or more in length, port side open
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Fishing vessel engaged in trawling, underway less than 50 metres in length, seen from ahead
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Fishing vessel engaged in trawling, underway possibly greater than 50 metres in length, seen from ahead
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Fishing vessel engaged in trawling, less than 50 metres in length, with outlying gear, starboard side open
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Vessel engaged in trawling, underway less than 50 metres in length, port side open, with gear out towards white light
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Two fishing vessels engaged in fishing, one with outlying gear, seen from starboard side
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Rule 27 - Vessels Not Under Command or Restricted in Their Ability to Manoeuvre
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Vessel not under command, underway
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Vessel, not under command, underway and making way, seen from ahead
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Vessel not under command, underway and making way, starboard side open
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Vessel underway and making way, not under command, port side open.
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Vessel probably over 50 metres in length, restricted in ability to manoeuvre, starboard side open
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Vessel engaged in towing, under 50 metres in length, restricted in ability to manoeuvre, starboard side open, probably a log boom
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Vessel engaged in towing less than 50m in length, with length of tow greater than 200m, restricted her ability to manoeuvre starboard side open
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Vessel restricted in her ability to manoeuvre, head on, with obstructions on her starboard side
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Vessel restricted in her ability to manoeuvre, head on, with obstructions on her starboard side and clear on her port side
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Vessel restricted in her ability to manoeuvre, seen from astern, underway or at anchor, with obstruction on her port side
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Minesweeping vessel, probably 50 metres or more in length, port side open
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Two power driven vessels, probably greater than 50 metres in length, underway and making way, restricted in their ability to manoeuvre, seen from starboard - probably replenishing at sea
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Rule 28 - Vessels Constrained by Their Draft
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Power driven vessel maybe more than 50 metres in length, underway and making way, starboard side open, constrained by her draft
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Power driven vessel maybe more than 50 metres in length, port side open, constrained by her draft
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Power driven vessel, seen from astern, constrained by her draft
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Rule 29 - Pilot Vessels
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Vessel on pilotage duty, seen from ahead
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Vessel on pilotage duty, underway, starboard side open
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Vessel on pilotage duty underway, and making way, seen from astern
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Pilot vessel, port side open, alongside power driven vessel possibly greater than 50 metres in length, both underway and making way
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Rule 30 - Anchored Vessels and Vessels Aground
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Vessel at anchor possibly greater than 50 metres in length, starboard side
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Vessel at anchor, with decklights, or power driven vessel underway and making way, showing improper decklights
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Vessel aground, seen from either end It could also be a vessel not under command seen from astern
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Vessel aground, starboard side open
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Vessel aground, port side
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Rule 31 - Seaplanes
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Seaplane, seen head on
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Others
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Power driven or sailing vessel underway from astern
Vessel less than 6 metres underway Any masthead light just above horizon Vessel being towed from astern (look for the tow) Vessel at anchor 50 metres or less
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Vessel in distress
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