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Plovput LLC limited liability commercial company for
maintenance of maritime waterways and radio service

Special marks

(excerpt from Regulations about way of marking of waterways and aids to navigation)

Special marks that indicate specific areas, facilities or features that are drawn and described in the official maritime navigation charts and publications and published in the "Notice to Seafarers" are used to mark:

  • system for collecting hydro meteorological and oceanographic data at sea
  • traffic separation, where the use of marks provided for in this Regulations may cause confusion
  • spoil ground
  • military exercise zones
  • laid submarine cables, pipelines and outfalls
  • zones of sports and other activities
  • mariculture zones
  • boundaries of anchorage areas
  • offshore structures.

Special marks are yellow, and their shape must be different from other marks provided for in the Regulations.


Special marks may carry a yellow »X« topmark.


Special marks may be lettered or numbered to indicate their purpose.


The light of the special marks is yellow of any rhythm, but different from the rhythms specified for the cardinal (basic) system, isolated danger marks and safety water marks.




Special marks
Colour Yellow
Shape Any, but different from other shapes of navigational marks
Topmark (if any) Yellow »X« shape
Light (if any) Yellow
Rhythm Any other than rhythm of cardinal marks, isolated danger marks and safety water marks

Plovput d.o.o. Obala Lazareta 1, 21000 Split +385 (0)21 390 600 +385 (0)21 390 630 OIB: 14480721492

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