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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.
International Tsunami Signs - ISO-approved (2008) (UNESCO) 国土交通省 ( Ministry of Land, Infrastructure, Transport and Tourism (Japan) ) 避難誘導のためのサインの体系 (The system of the sign for evacuation guide on tsunami)ホーム>>政策・仕事>>河川トップ>>海岸>> 海岸事業の紹介
A 1976 United States NOAA chart of part of Puerto Rico A nautical chart of the Warnemünde harbor shown on OpenSeaMap. A nautical chart or hydrographic chart is a graphic representation of a sea region or water body and adjacent coasts or banks.
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 ...
Date/Time Thumbnail Dimensions User Comment; current: 21:04, 22 June 2024: 913 × 800 (18 KB): Maxi123ID: Reverted to version as of 10:28, 6 March 2022 (UTC) 12:48, 12 March 2022
On the west coast of the United States, which is prone to tsunamis from the Pacific Ocean, warning signs indicate evacuation routes. In Japan, the populace is well-educated about earthquakes and tsunamis, and along Japanese shorelines, tsunami warning signs remind people of the natural hazards along with a network of warning sirens, typically ...
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