There are scraps of evidence in the Sagas, and in a set of ancient Norse sailing directions collected together during the sixteenth century.
IRhumb-imigca eyakrwelwa ngerula zazizona, zilungileyo nangona phakathi kwingqukuva (ngokuba aborhwebi ngokuwabo bebonakalisa lawingqukuva ngonyaka wekhulu lewaka linye linamakhulu mahlanu anamashumi mane ananye lenkatha yemisca.