The Professional Practices and Responsibilities (PPR) Course is an online course that you need to complete as part of the qualifications to gain a commercial endorsement.
It is a study of the legal environment you will be working under and requires study of various documents including MGN280.
This is a comprehensive course with several modules to work through including Commercial Environment, People, purpose and Vessel.
You can complete the modules in one sitting or over a period of time and there is a final timed assessment.