Rule 23 - Power-driven vessel underway.pdf

Rule 23 - Power-driven vessels underway

a) A power-driven vessel underway shall exhibit: I. a masthead light forward; II. a second masthead light abaft of and higher than the forward one; except

that a vessel of less than 50 metres in length shall not be obliged to exhibit such light but may do so;

III. sidelights; IV. a sternlight.

b) An air-cushion vessel when operating in the non-displacement mode shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit an all-round flashing yellow light.

c) A WIG craft only when taking off, landing and in flight near the surface shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit a high-intensity all-round flashing red light.

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d) I.A power-driven vessel of less than 12 metres in length may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and sidelights;

II.a power-driven vessel of less than 7 metres in length whose maximum speed does not exceed 7 knots may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an allround white light and shall, if practicable, also exhibit sidelights;

III.the masthead light or all-round white light on a power-driven vessel of less than 12 metres in length may be displaced from the fore and aft centreline of the vessel if centreline fitting is not practicable, provided that the sidelights are combined in one lantern which shall be carried on the fore and aft centreline of the vessel or located as nearly as practicable in the same fore and aft line as the masthead light or the all-round white light.

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A power-driven vessel underway shall exhibit: Less than 50 metres in length

One masthead light (may carry two) Two sidelights A sternlight

50 metres or more in length Two masthead lights Two sidelights A sternlight

Power-driven vessel underway Rule 23 (a)

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Rule 23 (a) Power-driven vessel less than 50 m in length Bow view Underway

Rule 23 - Power-driven vessels underway Power-driven vessel underway Rule 23 (a)

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Rule 23 (a) Power-driven vessel more or less than 50 m Port side view Underway


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By day At night 6


Rule 23 (a) Power-driven vessel more or less than 50 m Stern view Underway 7


Power-driven vessel less than 50 metres underway

In a power driven vessel of 20 metres or more in lenght the sidelights shall not be placed in front of the forward masthead light (Annex 1 (b))

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In a power-driven vessel of less than 20 metres in length, the sidelights may be placed in front of the masthead light (Annex 3 (b))

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Vessel less than 20m in length (Anex I 3(b))

The sidelights may be placed forward of the masthead light 10

Rule 23 (a) Power-driven vessel less than 20 m Underway Bow view With combined lantern Power-driven vessels less than 20 metres may replace their

sidelights by a combined lantern

Rule 23 - Power-driven vessels underway Power-driven vessel less than 20 m Rule 23 (a)

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A vessel is underway when:

She is not at anchor or Made fast to the shore or Aground

See Rule 3 (i)

Rule 23 - Power-driven vessels underway Underway Rule 23 (a)

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A vessel at anchor is not underway

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A vessel alongside is not underway 14


Vessel underway and making way through the water

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Rule 23 - Power-driven vessels underway Underway Rule 23(a)

Vessel underway but NOT making way through the water

This vessel must show the same lights as if she was making way through the water

This vessel may be waiting for a pilot 16

Advantages of two masthead lights: The course of the vessel can be assessed with some

accuracy Through the opening and closing of the lights course

alterations can be followed Should the only masthead light go out, the vessel will not

be mistaken for a sailing vessel


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The bearing of the observed vessel is 045. The opposite bearing is 225.

The two masthead lights are close under one another with the forward light slightly to her right (abt. 25).

Her estimated course is consequently about 250

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The two masthead lights of the observed vessel are now far more apart.

The course of the observed vessel is thus also further away of the opposite bearing; say abt. 090.

The course of the observed vessel is thus about 315.

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Rule 23 - Power-driven vessels underway Power-driven vessel underway Rule 2 3(a) When both sidelights are seen simultaneously, the course of the observed vessel is equal to her opposite bearing (up to 006)

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When both sidelights are seen simultaneously nearly ahead of your own vessel, the observed vessels course is opposite to your own course (up to 006).

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The masthead light(s) and the sidelights are visible up to 22,5 abaft the beam.

The sternlight is only visible from 22,5 abaft the beam.

In practice, they may slightly overlap one another.

When an observer is on that limit, the course of the observed vessel can be determined with some degree of accuracy.

When the red port light is seen, the course of the observed vessel is equal to her bearing minus 67,5 22


When the green starboard light is seen, the course of the observed vessel is equal to her bearing plus 67,5 23

An air-cushion vessel shall exhibit:

Same lights as a power-driven vessel, plus An all round flashing yellow light

Lower than the masthead lights where it can be most easily seen

Rule 23 - Power-driven vessels underway Air-cushion vessel Rule 23(b)

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Air-cushion vessels:

Partially afloat or Totally supported by an air-cushion Speeds of up to 80 miles per hour Subject to the wind Silhouette or lights may be different to their course Some make excessive noise and sound signals may not

be heard

Rule 23 - Power-driven vessels underway Air-cushion vessel Rule 23 (b)

Several types:

Hovercrafts Hydrofoils Jetfoils 25


Hovercraft

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Hydrofoil

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Jetfoil

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Rule 23 - Power-driven vessel underway

Rule 23 (b) Air-cushion vessel less than 50 m Underway Starboard side view

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Air-cushion vessel at night

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WIG craft shall exhibit

The same lights as a power-driven vessel plus A high intensity all round flashing red light When taking off, landing or in flight near the

surface

Rule 23 - Power-driven vessels underway Wig craft Rule 23 (c)

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Rule 23 (c) Wig craft landing, taking off or flying near the

surface 35


Wig craft at night

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Power driven vessel of less than 12 metres in length shall exhibit

Same lights as larger power-driven vessels OR An all round white light and Sidelights or a combined lantern (Rule 21 (b)

The masthead light or all-round white light may be displaced from the fore and aft centreline provided a combined lantern is carried located as nearly as practicable in the same fore and aft line as the masthead light or the all-round white light

Rule 23 - Power-driven vessels underway Power-driven vessel less than 12 m Rule 23 (d)

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Rule 23 (d) (i) Power-driven vessel less than 12 m Underway Bow view With all-round white light With sidelights

All-round white light

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Rule 23 (d) (i) and (iii) Power-driven vessel less than 12 m. Underway With combined lantern Masthead light or all-round white light off centreline Bow view (left) - Stern view (right)


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A power-driven vessel of less than 7 metres in length, maximum speed of 7 knots shall exhibit:

Same lights as larger power-driven vessels or An all round white light and if practicable Sidelights or a combined lantern (Rule 21(c))

Rule 23 - Power-driven vessels underway Power-driven vessel less than 7 m Rule 23 (d) (ii)

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Rule 23 (d) (ii) Power-driven vessel less than 7 m. Maximum 7

knots Underway. Without sidelights. ANY view


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Rule 23 (d) (ii) Power-driven vessel less than 7 m; max 7 knots Underway Bow view With combined lantern Small power-driven vessels may replace their sidelights by a

combined lantern


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Documents

Rule 23 - Power-driven vessel underway.pdf