Before revision: Terminology In a general sense, in different contexts the term has slightly different meanings, multiple expressions are used : summer navigation season; winter navigation season with some waterways closed; ice-free navigations season / independent navigation period when the ships can get through without the assistance from an icebreaker.
After revision: (for the Northern Hemisphere)Terminology In a general sense, in different contexts the term has slightly different meanings, multiple expressions are used : summer navigation season; winter navigation season with some waterways closed; ice-free navigations season / independent navigation period when the ships can get through without the assistance from an icebreaker.