You’ve spent three days in a budget hotel near the Old CGO Building in MMD Mumbai, stood in the queue since 0900 hours with a heavy folder of original documents, only to have the surveyor push your file back across the desk. The verdict is cold: you are exactly four days short of the required 18 months for your 2nd Mate FG or Class IV Part B assessment.
This is the nightmare scenario for every Indian seafarer. You’ve already resigned from your last ship, spent money on advanced courses, and booked your exam slots, only to realize your math didn't match the Directorate General of Shipping (DGS) criteria. Calculating sea service isn't just about counting days on a calendar; it is a precise regulatory process governed by the Merchant Shipping (STCW) Rules.
As a senior officer who has seen dozens of juniors lose months of their career due to simple calculation errors, I’m going to break down exactly how you must calculate your service to ensure your assessment is cleared on the first attempt.
The DGS Definition of a "Month" and "Day"
The most common mistake cadets and junior engineers make is assuming that a month of sea service is the same as a calendar month. For the MMD (Mercantile Marine Department), the calculation is strictly mathematical.
According to DGS guidelines, one month is defined as 30 days. To find your total eligible service, you must calculate the total number of days served across all your ships and divide that number by 30.
When counting days for a single voyage:
1. The Date of Sign-on and the Date of Sign-off both count as full days of service.
2. If you signed on on the 10th of March and signed off on the 15th of March, you have 6 days of sea service, not 5.
3. Every day spent on the Articles of Agreement counts, provided the vessel was not in "lay-up" or "dry dock" for an extended period without a crew.
For example, if you have three ships with the following durations:
* Ship 1: 182 days
* Ship 2: 175 days
* Ship 3: 185 days
Total = 542 days.
542 / 30 = 18.06 months.
If the requirement for your grade is 18 months, you are safe. If you had 539 days, you would be rejected, even though it looks like 18 months on a calendar.
The Crucial Role of the Sea Service Testimonial (SST)
Your Continuous Discharge Certificate (CDC) is a record of your movement, but the Sea Service Testimonial (SST) is the legal evidence of your professional experience. Without a correctly formatted SST, your days at sea are worth zero in the eyes of an MMD surveyor.
Every time you sign off from a vessel—whether it’s an Anglo Eastern tanker or a Synergy Marine bulk carrier—you must ensure your SST is signed by the Master (for deck side) or the Chief Engineer (for engine side).
Key details that must be 100% accurate on your SST:
* Vessel Name and IMO Number: Must match the DGS E-Governance database.
* Rank: Must match your Articles of Agreement.
* Type of Engine/GRT: For engineers, the Propulsion Power (KW) and whether the engine is UMS (Unmanned Machinery Space) is vital. For deck officers, the Gross Tonnage (GRT) determines if you qualify for FG or NCV.
* Nature of Voyage: Ensure it specifies Foreign Going (FG) or Near Coastal Voyage (NCV).
* Dates of Service: These must match the stamps in your CDC and the entries in the ship’s Official Log Book.
If there is even a one-day discrepancy between your CDC and your SST, the MMD will likely ask for a clarification letter from the company’s Mumbai or Chennai office, delaying your exam by weeks.
Calculating Service for Specific Grades
The requirements change as you climb the ranks. You must be aware of the specific "types" of service required for the CoC you are targeting.
For 2nd Mate (FG):
You generally need 36 months of sea service, which can be reduced to 12 months if you have completed a DGS-approved pre-sea training program (like a B.Sc. in Nautical Science or DNS). However, remember that at least 6 months of this service must involve bridge watchkeeping duties under the supervision of a qualified officer. This must be explicitly stated in your SST.
For Class IV Marine Engineer:
You need to complete 6 months of sea service as a Junior Engineer or Trainee Marine Engineer. A critical point here is the Engine Room Watchkeeping certificate. Your sea service calculation for the MMD assessment only starts counting toward your "watchkeeping" requirement after you have obtained your Engine Room Watchkeeping (ERWK) certificate.
For Chief Mate / Class II:
The calculation becomes more complex because the MMD looks for "Watchkeeping Service" after obtaining your previous Certificate of Competency (CoC). If you worked for 2 months on a ship before your previous CoC was issued, those 2 months cannot be counted toward your next grade’s eligibility.
Handling "Off-Articles" and Port Stay Complications
A common point of confusion is whether time spent in port or during repairs counts.
1. Port Stays: As long as you are "on articles," time spent at anchor or alongside in ports like Kandla or Visakhapatnam counts fully toward your sea service.
2. Dry Dock: If the vessel is in dry dock and you are on board and on articles, the service usually counts. However, if the vessel is "out of commission" or the crew is signed off the articles and kept on "yard pay," that time does not count for MMD eligibility.
3. Ship-to-Ship (STS) Transfers: If you are on a daughter vessel or a storage tanker that doesn't move, the MMD may apply different rules. Always check the latest DGS Circulars regarding "stationary vessels."
4. Sick Leave/Hospitalization: If you are signed off for medical reasons in a foreign port, your sea service stops the day you sign off the articles, even if the company keeps you on the payroll during recovery.
Digital Verification: The DGS E-Governance Portal
In 2025, the physical calculation is only half the battle. Your Master Checker on the DGS E-Governance portal must reflect your service.
Before you even think about heading to the MMD for assessment, log in with your INDoS number and password. Check the "Sea Service Details" section. If your last voyage with Fleet Management or Bernhard Schulte isn't uploaded by the company, the MMD surveyor cannot verify your service.
If the data is missing:
* Contact your company’s crewing department immediately.
* Provide them with a scanned copy of your CDC and SST.
* Wait for the "Company Upload" to reflect in your profile.
* Ensure your Seafarer's Profile is updated with your latest photograph and signature, as per the Comprehensive Inspection Programme (CIP) guidelines.
The MMD will cross-reference your physical SST with the digital data. If the dates don't match to the day, your file will be marked "Query Raised," and you will be sent back to the company for rectification.
Your Next Step
Calculating your sea service correctly is the foundation of a stress-free exam season. Once you have your dates verified, you need to shift your focus to the actual MMD written and oral examinations.
At Sailrnetwork, we’ve built tools specifically for the Indian seafarer to bridge the gap between sea service and CoC success. Use SailrAI to clarify complex MARPOL or SOLAS doubts that often come up in MMD orals. If you are preparing for your functions, our exam prep module and SailrQ question bank feature recent MMD oral questions from centers like Kolkata, Chennai, and Noida. For those moving into senior ranks, our CII Calculator helps you understand the operational efficiency metrics you'll be expected to manage as a Chief Officer or Second Engineer.
Don't leave your eligibility to chance. Double-check your math, verify your E-Governance profile, and get your SSTs in order before you book that MMD seat.
Always verify current requirements and procedures at [dgshipping.gov.in](https://dgshipping.gov.in)