According to the glossary of terms in the United States Coast Guard Light list, an Aid to Navigation is any device external to a vessel or aircraft specifically intended to assist navigators in determining their position or safe course, or to warn them of dangers or obstructions to navigation.
In the IALA B system, the red ATONs are on your right when you return from sea (Red Right Returning) and the green on your left. Red daybeacons are triangles and green daybeacons are squares. All of these ATONs are Lateral Markers that mark traffic channels and where it is safe to travel.
On Non-Lateral Markers, there are some shapes that show certain things:
Patent No. 7,693,177 Issued on April 6, Assigned to FURUNO ELECTRIC for Navigational Aid, Carrier Sense Technique (Japanese Inventor)
Apr 07, 2010; ALEXANDRIA, Va., April 7 -- Yasushi Hiraoka, Nishinomiya, Japan, has developed a navigational aid and carrier sense technique....
WIPO PUBLISHES PATENT OF FRANCE TELECOM FOR "NAVIGATIONAL AID HAVING IMPROVED PROCESSING OF DISPLAY DATA" (FRENCH INVENTORS)
Dec 01, 2011; GENEVA, Dec. 1 -- Publication No. WO/2011/144849 was published on Nov. 24. Title of the invention: "NAVIGATIONAL AID HAVING...