Rahul stood outside the Mercantile Marine Department (MMD) office in Mumbai, clutching a folder of original documents and a rejected assessment form. He had calculated his sea time for the 2nd Mate (FG) oral examinations three times, concluding he had exactly 365 days of required service. However, the surveyor pointed out that because two of his ships were "laid up" for repairs for a combined total of 12 days, and he had failed to subtract those from his actual "sailing" time, he was short of the eligibility criteria. Rahul now faced a three-month delay, a wasted trip to the MMD, and the frustration of missing the current exam cycle.
This scenario is common among Indian seafarers. Whether you are a cadet aiming for your first COC or a Second Engineer appearing for MEO Class I, the way you calculate your sea service can make or break your career progression. The Directorate General of Shipping (DGS) is meticulous. If your math doesn't match their logic, your application will be rejected.
The Fundamentals of DGS Sea Time Calculation
In the Indian maritime context, sea service is not just the duration between your sign-on and sign-off dates. It is defined as the period spent serving on board a vessel that is "at sea" or "actively trading." For the DGS, your primary proof of service is your Continuous Discharge Certificate (CDC) and the entries made in your INDoS profile.
The first rule of thumb is the Inclusive Principle. When calculating the duration of a single voyage, both the day of engagement (sign-on) and the day of discharge (sign-off) are counted as full days of service. For example, if you signed on a vessel at Jawaharlal Nehru Port Trust (JNPT) on the 10th of March and signed off on the 20th of March, your total service is 11 days, not 10.
However, simply adding up days from your CDC is insufficient. You must categorize your time based on the type of vessel (Foreign Going vs. Near Coastal Voyage) and the nature of your duties. For deck officers, this involves distinguishing between general sea service and Bridge Watchkeeping time. For engineers, it involves documenting Engine Room Watchkeeping or "Ums" (Unmanned Machinery Space) duties.
The "30-Day Month" Logic and Broken Periods
The most frequent error candidates make is using a standard 365-day calendar year without accounting for how the DGS processes "broken periods." When you have served on multiple vessels—perhaps a 4-month stint with Synergy Marine followed by a 6-month contract with Anglo Eastern—you cannot simply add the months.
The DGS methodology requires you to:
1. Calculate the total number of days for each individual ship.
2. Sum the total days from all ships.
3. Divide the total number of days by 30 to determine the number of "months" of service.
4. The remaining days are treated as "days."
For example, if your total service across three ships adds up to 374 days, the MMD will calculate this as 12 months and 14 days (374 divided by 30). If the requirement for your exam is 12 months, you are safe. But if your total days add up to 358, you are short, even if those days spanned across 12 calendar months on paper.
Always remember: A "month" for MMD eligibility is strictly 30 days. When filling out your Form 29 (for deck) or the relevant assessment forms for engineers, ensure your math follows this 30-day rule to avoid discrepancies during the scrutiny of your Sea Service Testimonials.
Watchkeeping Certificates and Testimonials
Your CDC proves you were on the ship, but the Sea Service Testimonial proves what you did while you were there. This is a critical document that must be signed by the Master (for deck) or the Chief Engineer (for engine) and must bear the official ship’s stamp.
For 2nd Mate (FG) candidates, the DGS requires at least 6 months of "Bridge Watchkeeping" duties under the supervision of a qualified officer. If your testimonial says you were on board for 12 months but only performed 5 months of watchkeeping because the rest of the time was spent on "day work" or the ship was in dry dock, you will not meet the MMD criteria for the COC.
Engineers face a similar hurdle. For MEO Class IV, the DGS requires specific "Engine Room Watchkeeping" time. If you served on a vessel with a UMS notation, your testimonial must explicitly state that you were part of the duty engineer rotation.
A specific Indian requirement to watch out for is the verification of these testimonials. Many MMD exam centers, such as MMD Kolkata or MMD Chennai, now require the company (e.g., Fleet Management or Bernhard Schulte) to send a direct verification of your sea service to the MMD or upload it to the DGS E-Governance portal. If your company hasn't updated your sea service in the Master’s Checker on the DGS website, your physical documents—no matter how accurate—will not be accepted.
Accounting for Non-Sailing Time (Dry Docks and Lay-ups)
This is where many senior cadets and junior officers get caught off guard. Sea service, by definition, requires the vessel to be operational.
If your vessel was in a dry dock in Dubai or Singapore for 45 days, that time counts differently. Generally, the DGS allows a certain percentage of "port time" or "dry dock time" to be counted toward your total sea service, but there are strict limits. If the vessel is "laid up" (out of commission) or if you are serving on a vessel that is not "self-propelled," that time is often excluded from the mandatory sea service required for a COC.
Furthermore, if you are claiming service on Offshore Supply Vessels (OSVs) or DP vessels, the calculation changes again. The DGS has specific circulars regarding the conversion of "Offshore Time" to "Foreign Going Time." Usually, offshore time is credited at a 2/3rd rate or requires a longer duration to equal the FG requirement. Always check the latest DGS Circulars if your experience is on non-trading vessels.
Documentation Checklist for a Smooth Assessment
Before you book your seat at any MMD, ensure your documentation is airtight. A single missing stamp or a date mismatch between your CDC and your Sea Service Testimonial can lead to a "query" on your profile, which takes weeks to resolve.
1. CDC Entries: Ensure the "Date of Engagement" and "Date of Discharge" are clearly stamped and signed. The port of engagement (e.g., Kochi or Visakhapatnam) must be legible.
2. INDoS Profile: Log into the DGS website and check your "Master’s Checker." Your sea service for every vessel must be uploaded by the RPSL-authorized company. If it’s missing, contact your company’s HR immediately.
3. Sea Service Testimonials: These must be on the company’s letterhead or the official DGS format. Ensure the "Total Days at Sea" and "Watchkeeping Days" are clearly bifurcated.
4. Passport and SID: Ensure your Seafarer Identity Document (SID) and Passport have entry/exit stamps that align with your sign-on/sign-off dates.
5. Articles of Agreement: For Indian-flagged vessels, keep a copy of the Articles of Agreement to verify the dates if the CDC entry is blurred.
Your Next Step
Calculating sea service is the first hurdle in your journey toward a higher COC. Once you have confirmed your eligibility, the real work begins—preparing for the written and oral examinations.
At Sailrnetwork, we provide the tools to make this transition seamless. Use our SailrAI to clarify complex DGS regulations, or dive into our exam prep module for the latest MMD oral questions. If you are managing your career long-term, our CII Calculator and SailrQ community can help you stay ahead of industry standards and connect with peers who have recently cleared their assessments at your specific MMD center.
Always verify current requirements and procedures at [dgshipping.gov.in](https://dgshipping.gov.in)