The Icelandic Coast Guard (Icelandic: Landhelgisgæsla Íslands, Landhelgisgæslan or simply Gæslan) is the service responsible for Iceland's coastal defense and maritime and aeronautical search and rescue. Its origins can be traced to 1859, when the corvette Ørnen started patrolling Icelandic waters. In 1906, Iceland's first purposely built guard-ship, Islands Falk, began operation. Iceland's own defense of its territorial waters began around 1920 and the Icelandic Coast Guard was formally founded on July 1, 1926. The first cannon was put on the trawler Þór in 1924 and on June 23, 1926 the first ship built for the Coast Guard, named Óðinn, arrived in Iceland. Three years later, on the 14 July 1929 the coastal defence ship Ægir was added to the Coast Guard fleet.