The Maritime Office of Slupsk advises mariners that temporary shallows exist in the approach channel leading to the Harbour of Dzwirzyno.
 Until dredging works are completed, all inbound and outbound vessels are obliged to seek for prior information on the current navigational
 situation existing within the harbour entrance with Dzwirzyno Harbour's Boatswain Office or Kolobrzeg Harbour Master.