In medieval Norway, a unit of distance used by mariners, (Danish uge siøes, Dutch weeke see, all occurring with a variety of spellings, and all meaning “week of sea”.) It also often occurs as simply siovar. About 6 nautical miles.
The Norse vika sjovar and the nautical mile.
The Mariner's Mirror, volume 87, no. 4, pages 390-403 (November 2001).
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