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In page Cape Finisterre:

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Likewise, the latitude of Cape Finisterre was used to signal that a change of flags flown by Norwegian and Swedish merchant ships was required.[citation needed] Following independence and the subsequent union with Sweden in 1814, Norwegian merchant ships were required to fly the Swedish flag (until 1818) and the Swedish flag with the Norwegian (the Dannebrog with the Norwegian lion) flag in the canton. From 1818 to 1821, Swedish merchant ships also flew this flag in place of the Swedish flag (until 1844) when sailing south of Cape Finisterre.