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According to ICAO Annex 14, a spherical red marker with a diameter of 60 cm, displayed on or adjacent to an object, with the appearance of being suspended at low level in the air indicates the presence of…

  • A
    Dangerous activities on the ground within a specific distance from an airport.
  • B
    A high obstacle with a small surface area.
  • C

    A parachute jumping area or site.

  • D
    An overhead cable or wire.

Refer to figure.
— A marker displayed on an overhead wire, cable, etc., should be spherical and have a diameter of not less than 60 cm.

Source: ICAO Annex 14

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