English: Sea cairn in the Finnish archipelago, between Houtskär and Korpo in the Archipelago Sea. Cairns like this are used as navigation aids and usually mark a place that is safe to approach, e.g. during conditions of reduced visibility. They are maintained as other sea marks but are given no official function. Many cairns of this or similar type have (since the 1990's?) been replaced by big white signs.
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