Also dag gesiglan [Anglo-Saxon], dægr sigling [Icelandic]. In medieval Norway, a unit of distance used by mariners, = 2 døgr, about 72 nautical miles, about 133 kilometers.
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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