SeaTime Calculator
Accurately calculate your total sea service days for Certificate of Competency (CoC), license renewal, and rank promotion. Compliant with MCA, USCG, and STCW standards.
SeaTime Calculator
Add your voyage details to calculate total sea service
Date you joined the vessel
Date you left the vessel
SeaTime Results
Your total qualifying sea service
Add your voyage details using the form, then click Calculate Total SeaTime to see your accumulated sea service days.
SeaTime FAQ
Answers to the most common questions about SeaTime calculation and its importance for your maritime career.
SeaTime, or sea service, is the measure of a mariner’s lifetime experience working on vessels at sea. It is crucial for obtaining or renewing maritime licenses, Certificates of Competency (CoC), and for rank promotion. Regulatory bodies like the MCA and USCG require a specific number of sea service days as a core eligibility criterion [[14]].
SeaTime is typically calculated based on the number of days spent working on a vessel. One day of sea service is generally considered to be 8 hours on the water. The total is often computed as (Detach Date – Report Date) for each voyage, and these are summed across all voyages to get the total qualifying sea service [[29], [32]].
To accurately calculate your SeaTime, you need details for each voyage, including the vessel name, your rank/position, the vessel type, and the report (start) and detach (end) dates for your service on that vessel [[19]].
This SeaTime calculator is essential for applications related to Certificates of Competency (CoC), license renewals, and rank promotions under authorities like the UK’s MCA and the US Coast Guard (USCG). Accurate sea time computation is a fundamental requirement for these processes [[3], [24]].
No, this is a client-side calculator. All calculations are performed in your browser, and your voyage data is not sent to or stored on any server, ensuring your privacy and security.