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Scharhörn daymark as an illustration on a 1721 map

A daymark or a day marker is the daytime identifier (attached signboard) of an aid to navigation (ATON) or daybeacon.[1]

Generally, the daymark conveys to the mariner during daylight hours the same significance as does the aid's light or reflector at night.[2]

Daymark chart symbolsEdit

[3][further explanation needed]

Paper chart Simplified Simplified symbol name
Square or rectangular daymark
Triangular daymark, point up
Triangular daymark, point down
Retro reflector

See alsoEdit


  1. ^ "Nautical Terms for boating and marine industry terminology". Retrieved 2017-03-08.
  2. ^ Light List, Volume II, Atlantic Coast. Washington, DC: US Government Printing Office. 2015. pp. ix.
  3. ^ US Chart No. 1: Symbols, Abbreviations and Terms used on Paper and Electronic Navigational Charts. Department of Commerce National Oceanic and Atmospheric Administration Department of Defense National Geospatial-Intelligence Agency. 2013. p. 86.