Flags, Morse code, Q code - everything you need to boost sailing practice with theory - in your pocket. Sailor Toolbox - theory for sailing.
Remind yourself format of distress, urgency and safety messages. Figure out how to cancel alert.
Practice IWC, SRC and LRC questions to pass the exam in Polish Office of Digital Communication. Review safety checklist to discuss important aspects with boarding crew.
Review Beaufort and Petersen scales and identify properly current state of wind and sea.