When do I need to revalidate? 

• You need to revalidate your CoST every 5 years to keep it current.  
• If you apply within 6 months before your certificate expires, your new certificate will be valid for 5 years from your current expiry date.  
• If you apply more than 6 months before expiry, or after your certificate has expired, your new certificate will be valid for 5 years from the date of issue.  
• You need to undertake a refresher training course once within the 5 year period – you do not need to wait until your expiry date is close before undertaking refresher training 

What sea service do I require 

• While on vessels 24 metres or longer with propulsion power 750 kW or more while holding CoST, have completed either: 
  • 360 days sea service in the 5 years immediately before you apply or 
  • 90 days sea service in the 6 months immediately before you apply 

• For all other sea service scenarios, please contact AMSA Connect

What else do I need 

• Complete AMSA Seafarer Form 419 
• Proof of ID 
• Sea service letter from your employer