Advanced Powerboat is two parts, there is the Advanced Powerboat course, for which you get issued with a certificate confirming you've completed the course, and the exam for the Certificate of Competence issued by the RYA and MCA. Most schools offer the exam as a third day to the course.
The exam requires more sea time than the course, plus a first aid certificate (from the list the RYA accepts), and a higher level of theoretical knowledge (Yachtmaster theory) than the course (DaySkipper Theory) and a radio course (VHF SRC is the current one).
Once you've got the Advanced Powerboat exam passed you can set out to commercially endorse it, for that you'll need a sea survival ticket (RYA or STCW, if you're going to go into commercial stuff my view is the STCW is more useful), a medical (ML5 oe ENG1, again for bigger commercial stuff the ENG1 is more sought after) and a Personal Practices and Responsibilities certificate, which you can study and do the exam for online.
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