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They are recognisable by their red-and-white vertical stripes and commonly bear a top sign in shape of a red ball. They either flash Morse code "A" (di-dah), or one long flash, occulting (more light than dark) or isophase (equal light and dark) every 10 seconds (L Fl 10s).
Diagram of cardinal marks as seen during the day, with their light patterns. The lights shown here are configured as "Quick". A cardinal mark is a sea mark (a buoy or other floating or fixed structure) commonly used in maritime pilotage to indicate the position of a hazard and the direction of safe water.
The sign is commonly referred to as a radioactivity warning sign, but it is actually a warning sign of ionizing radiation. Ionizing radiation is a much broader category than radioactivity alone, as many non-radioactive sources also emit potentially dangerous levels of ionizing radiation.
Red flags fly on beaches due to dangerous rip currents and high surf. Here's how to stay out of harms way.
Stinging jellyfish, rays with their whip-like tails and sharks on the hunt are some ocean hazards that might typically worry beachgoers. Six people drowned in rip currents over a recent two-day ...
Stored rip current warning signs in the Netherlands. A warning sign in France. Rip currents are a potential source of danger for people in shallow water with breaking waves, whether this is in seas, oceans or large lakes. [7] Rip currents are the proximate cause of 80% of rescues carried out by beach lifeguards. [10]
A distress signal indicates that a person or group of people, watercraft, aircraft, or other vehicle is threatened by a serious or imminent danger and requires immediate assistance. [1]: PCG D−3 Use of distress signals in other circumstances may be against local or international law .
A 'Danger' sign from the 1914 Universal Safety Standards. One of the earliest attempts to standardize safety signage in the United States was the 1914 Universal Safety Standards. [1] The signs were fairly simple in nature, consisting of an illuminated board with "DANGER" in white letters on a red field. [1]