Petersburg Riga Dunrossness ... Aberdeen 1758,9 Yarmouth ' 759 , 9 Valentia ... 757,7 765 , 8768.6768.7 768.6768.7 767.8767.7 767.9764 , o764.0764.1769.1 764 , o764.0764.1769.1 764.0764.1769.1 764.1769.1 768.3765.4761.5 765.4761.5762.9761.4759.7