(a) North Atlantic Winter Seasonal Zones I and II. (1) The North Atlantic Winter Seasonal Zone I lies within the meridian of longitude 50[deg] W. from the coast of Greenland to latitude 45[deg] N.; thence the parallel of latitude 45[deg] N. to longitude 15[deg] W.; thence the meridian of longitude 15[deg] W. to latitude 60[deg] N.; thence the parallel of latitude 60[deg] N. to the Greenwich Meridian, thence this meridian northwards.
(1) The North Atlantic Winter Seasonal Zone I lies within the meridian of longitude 50[deg] W. from the coast of Greenland to latitude 45[deg] N.; thence the parallel of latitude 45[deg] N. to longitude 15[deg] W.; thence the meridian of longitude 15[deg] W. to latitude 60[deg] N.; thence the parallel of latitude 60[deg] N. to the Greenwich Meridian, thence this meridian northwards.
(i) Seasonal periods: Winter: October 16 to April 15.Summer: April 16 to October 15.
(2) The North Atlantic Winter Seasonal Zone II lies within the meridian of longitude 68[deg]30[min] W. from the coast of the United States to latitude 40[deg] N.; thence the rhumb line to the point latitude 36[deg] N., longitude 73[deg] W.; thence the parallel of latitude 36[deg] N. to longitude 25[deg] W.; and thence the rhumb line to Cape Torinana. Excluded from this zone are the North Atlantic Winter Seasonal Zone I and the Baltic Sea bounded by the parallel of the latitude of The Skaw in the Skagerrak.
(i) Seasonal periods: Winter: November 1 to March 31.Summer: April 1 to October 31.
(b) North Atlantic Winter Seasonal Area. (1) The boundary of the North Atlantic Winter Seasonal Area is the meridian of longitude 68[deg]30[min] W. from the coast of the United States to latitude 40[deg] N.; thence the rhumb line to the southernmost intersection of the meridian of longitude 61[deg] W. with the coast of Canada; and thence the east coasts of Canada and the United States.
(1) The boundary of the North Atlantic Winter Seasonal Area is the meridian of longitude 68[deg]30[min] W. from the coast of the United States to latitude 40[deg] N.; thence the rhumb line to the southernmost intersection of the meridian of longitude 61[deg] W. with the coast of Canada; and thence the east coasts of Canada and the United States.
(i) Seasonal periods:
(a) For vessels over 328 feet in length: Winter: December 16 to February 15.Summer: February 16 to December 15.
(b) For vessels of 328 feet and under in length: Winter: November 1 to March 31.Summer: April 1 to October 31.
(c) North Pacific Winter Seasonal Zone. The southern boundary of the North Pacific Winter Seasonal Zone is the parallel of latitude 50[deg] N. from the east coast of the Union of Soviet Socialist Republics, to the west coast of Sakhalin; thence the west coast of Sakhalin to the southern extremity of Cape Kril'on: thence the rhumb line to Wakkanai, Hokkaido, Japan; thence the east and south coasts of Hokkaido to longitude 145[deg] E., thence the meridian of longitude 145[deg] E. to latitude 35[deg] N., thence the parallel of latitude 35[deg] N. to longitude 150[deg] W. and thence the rhumb line to the southern extremity of Dall Island, Alaska.
(1) Seasonal periods: Winter: October 16 to April 15.Summer: April 16 to October 15. [CGFR 68-60, 33 FR 10068, July 12, 1968, as amended by CGFR 68-126, 34 FR 9016, June 5, 1969]