buoy indicates the location of shoal
1Gravelly Shoal Light — Infobox Lighthouse name = Gravelly Shoal Light caption = Undated USCG photo location = Saginaw Bay, Michigan coordinates = coord|44|1|6|N|83|32|14|W yearbuilt = 1939 yearlit = 1939 automated = yeardeactivated = foundation = 50 foot diameter… …
2Glossary of nautical terms — This is a glossary of nautical terms; some remain current, many date from the 17th 19th century. See also Wiktionary s nautical terms, Category:Nautical terms, and Nautical metaphors in English. Contents: A B C D E F G H I J K L M N O P Q R …
3Lighthouse — For other uses, see Lighthouse (disambiguation). Speculative drawing (c. 2006) of the Lighthouse of Alexandria, on the island of Pharos …
