Professional competence
                        
                        
                        
                        
                           1 Continued professional competence as required under
                           regulation I/11 shall be established by: 
                        
                        
                        
                        
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                                 .1 approved seagoing service, performing
                                 functions appropriate to the certificate held, for a period of at least:
                               
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                                       .1.1 twelve months in total during the
                                       preceding five years, or
                                     
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                                       .1.2 three months in total during the
                                       preceding six months immediately prior to revalidating; or
                                     
 
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                                 .2 having performed functions considered to be
                                 equivalent to the seagoing service required in paragraph 1.1; or
                               
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                                 .3 passing an approved test; or
                               
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                                 .4 successfully completing an approved training
                                 course or courses; or
                               
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                                 .5 having completed approved seagoing service,
                                 performing functions appropriate to the certificate held, for a period of
                                 not less than three months in a supernumerary capacity, or in a lower
                                 officer rank than that for which the certificate held is valid immediately
                                 prior to taking up the rank for which it is valid.
                               
 
                     
                     
                     
                        
                        
                         
                           2 The refresher and updating courses required by
                           regulation I/11 shall be approved and include changes in
                           relevant national and international regulations concerning the safety of life at
                           sea, security and the protection of the marine environment and take account of any
                           updating of the standard of competence concerned. 
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           3 Continued professional competence for tankers as
                           required under regulation I/11, paragraph 3 shall be established by: 
                        
                        
                        
                        
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                                 .1 approved seagoing service, performing duties
                                 appropriate to the tanker certificate or endorsement held, for a period of
                                 at least 3 months in total during the preceding 5 years; or
                               
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                                 .2 successfully completing an approved relevant
                                 training course or courses.
                               
                           4 Continued professional competence for masters and
                           officers on board ships operating in polar waters, as required under regulation
                           I/11, shall be established by: 
                        
                        
                        
                        
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                              .1 approved seagoing service, performing functions appropriate
                                 to the certificate held, for a period of at least two months in total during
                                 the preceding five years; or 
                               
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                              .2 having performed functions considered to be equivalent to the
                                 seagoing service required in paragraph 4.1; or 
                               
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                              .3 passing an approved test; or  
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                              .4 successfully completing an approved training course or
                                 courses.