عَدَوْلِيَّةٌ أَوْ مِنْ سَفِينِ ابْنِ يَامِنٍ / يَجُورُ بِهَا الْمَلَّاحُ طَوْرًا وَيَهْتَدِي
They are vessels of the ʿAdawliyyah kind, or ships associated with Ibn Yāmin; the sailor at times turns them off course and at times finds the proper direction.
ʿAdawliyyah identifies a type or provenance of vessel; Ibn Yāmin is another name linked with ships. Yajūru here suggests deviating or turning, whereas yahtadī indicates finding the right course.