Petersburg , Riga 757,3 Dunrossness .. 750,1 750,6 747.5 753,2 750.9 751.9 751.6 748.8 747.9 748.9 749.1 746.9 748.6749.8751 , 5752 , 4 749.8751 , 5752 , 4 751 , 5752 , 4 757.9758.1 761.2 Aberdeen .. Yarmouth.