'What is a commercial endorsement?
It is an endorsement is printed on your RYA certificate of competence to show that you have undergone additional training and a medical fitness test, enabling you to work on commercial vessels'
Which certificates can be commercially endorsed?
The following certificates can receive the standard commercial endorsement:
RYA Yachtmaster Ocean Certificate of Competence
RYA Yachtmaster Offshore Certificate of Competence
RYA Coastal Skipper Certificate of Competence
RYA Day Skipper (tidal) practical course completion certificate
RYA Day Skipper (non-tidal) practical course completion certificate, only if supported by a Day Skipper shorebased course completion certificate
RYA Advanced Powerboat Certificate of Competence
RYA Advanced Powerboat course completion certificate (only if issued before January 1, 2005)
RYA Powerboat Level 2 course completion certificate
In addition, the RYA Yachtmaster Offshore and Yachtmaster Ocean Certificates of Competence can receive the STCW endorsement.
Which certificate do I need?
The MCA's codes of practice categorise British flagged commercial yachts according to the type of yacht and the waters in which they operate. It is this categorisation that determines which of the above certificates you will need.' RYA website
well if you 'work' your boat ie provide a service for money it is a commercial operation therefore need coding,
The skipper needs to hold a certificate of competence that covers the type of boat and area of operation, and if a coded boat on a commercial operation the skippers ticket needs to be commercially endorsed
do endorse a ticket you only need a Personal Survival Techniques STCW95 certificate and a ML5 medical from your doctor.
it costs £20 to the RYA here is the form;
there is a matrix;
and info on when and why to code your boat