When to show Navigation lights

Navsregs>COLREGS>When to show Navigation lights
Ferry mast

Turn on the Navigation Lights

Bit of backtracking in this post, back to the fundamental question of when to turn the navigation lights on. 

What COLREG  Rule states when navigation lights should be shown?

Rule 20

​When must Navigation lights be shown?

  • Sunset to Sunrise-During the day
  • Sunrise to Sunset-During the night
  • In restricted visibility
  • May be exhibited in all other circumstances when it is deemed necessary.

What other lights can be shown from sunset to sunrise?

No other lights shall be exhibited, except such lights as:

  • Cannot be mistaken for the lights specified in the COLREGS
  • Do not impair their visibility or distinctive characterer
  • Do not Interfere with the keeping of a proper look-out

What is Restricted Visibility?

This is  any condition in which visibility is restricted by:

  • Fog
  • Mist
  • Falling snow
  • Heavy rainstorms
  • Sandstorms
  • Any other similar causes.

See COLREG Rule 3

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