Before revision: 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: TerminologyIn 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.