Also dag [Anglo-Saxon], dægr [Icelandic]. In medieval Norway, a unit of distance used by mariners, nominally the distance a ship could be rowed in one day, about 36 nautical miles, about 67 kilometers. Fløttum says it is the same magnitude as the later mileskift.
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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