Lights and Shapes Flashcards
Rule 20: Application
When shall the Rules concerning the shapes be complied with ?
By day.
Rule 20: Application
When shall the Rules concerning the lights be complied with ?
Shall from sunset to sunrise
Shall From sunrise to sunset in restricted visibility
May in all other circumstances when deemed necessary.
Rule 21: Definitions
Define Masthead light
Unbroken light
Arc horizon 225 degrees
Right ahead to 22.5 degrees abaft the beam on either slides
Rule 21: Definitions
Define Sidelights ?
Unbroken light
Arc horizon 112.5 degrees
From right ahead to 22.5 degrees abaft the beam on either sides
Vessels of less 20m : sidelights may be combined in one lantern, fore and aft centreline of the vessel.
Rule 21: Definitions
Define Sternlight ?
Unbroken light
Arc horizon 135 degrees
67.5 degrees from right aft on each side
Rule 21: Definitions
Define towing light ?
Same as Sternlight but yellow light.
Rule 21: Definitions
Define All-round light ?
Unbroken light
Arc horizon 360 degrees
Rule 21: Definitions
Define Flashing light ?
Flashing at regular intervals at a frequency of 120 flashes or more per minute.
Rule 22: Visibility of Lights
For vessels of 50m or more ?
Masthead : 6 nm
Sidelight : 3 nm
Sternlight : 3 nm
Towing light : 3 nm
All-round light : 3 nm
Rule 22: Visibility of Lights
For vessels of less then 50m / more then 12m.
Masthead : 5 nm (3 nm for vessel less then 20m)
Sidelight : 2 nm
Sternlight : 2 nm
Towing light : 2 nm
All-round light : 2 nm
Rule 22: Visibility of Lights
For vessels less then 12m ?
Masthead : 2 nm
Sidelights : 1 nm
Sternlight : 2 nm
Towing light : 2 nm
All-rouns lights : 2 nm
Rule 22: Visibility of Lights
For inconspicuous, partly submerges vessels or objects being towed ?
All-round white light : 3 nm
