Description
-
Day shapes or day markers are mast head signals comprised of geometric shapes.
-
These signals convey the status of a vessel on navigable waters during daylight hours.
-
The four basic shapes of the markers are ball, cylinder, cone, and diamond.
-
The day shapes are used alone or in combination to provide a range of status updates visible during the day and are intended to mimic the navigation light requirement during nightfall or poor visibility.
-
Day shapes are required to be deployed from sunrise to sunset and are typically hung from a mast for ease of visibility from a distance.
-
DIA.: 610
