Isolated Danger Marks


  • Placed on or above an isolated danger of limited extent - eg a rock or wreck
  • Two black balls on the top
  • Black with Red bands.
  • Light, if any, is a group of 2 white flashes.

By Day.

By Night.




Memory Aids:-

  • Often known as a “Dennis the Menace” since the 1960’s cartoon character originally wore red and black striped T-shirts!
  • Two balls - and two white flashes.   Think of the “two” things.

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