Day Skipper and VHF theory, explained

Plain explainers for the Day Skipper theory and VHF SRC exam: tides, buoyage, cardinal marks, radio calls, the ICC and chartering.

• The rule of twelfthsHow the rule of twelfths estimates tide height hour by hour, with a worked example, a quick table, and when not to trust it.
• IALA Region A vs Region BThe one difference between IALA buoyage Region A and Region B, which countries use each, and the marks that are the same in both.
• Cardinal marksHow to read north, east, south and west cardinal marks by their topmarks, colours and white lights, and which side to pass them.
• VHF SRC exam questionsWhat the VHF Short Range Certificate exam covers, with sample questions on channel 16, DSC, Mayday, Pan Pan and Securite calls.
• The ICC (International Certificate of Competence)What the ICC is, who needs one to charter abroad, and the usual ways UK sailors get it: Day Skipper practical or an ICC assessment.
• Do you need Day Skipper to charter?What charter companies usually ask for before a bareboat charter: a qualification such as Day Skipper or the ICC, a VHF operator's certificate, and experience.