DG Shipping Sea Time Calculator
Add each voyage/contract period from your CDC records. The calculator counts inclusive days (sign-on and sign-off both included), subtracts non-qualifying days, and totals your net sea service.
| Sign-on Date | Sign-off Date | Non-Qualifying Days | Vessel / Notes | Calendar Days | Qualifying Days | Action |
|---|
Note: This tool is for planning/reference. Always confirm final eligibility with current DG Shipping circulars, company records, and approved documentation.
What is a DG Shipping sea time calculator?
A DG Shipping sea time calculator helps seafarers estimate qualifying sea service for competency exams, certificate upgrades, and training eligibility. Instead of manually counting days across multiple contracts, this tool totals your sea service periods and shows a net figure after deductions.
If you are preparing documents for an exam application, RPSL verification, or company HR request, accurate sea-time counting can save a lot of correction work later. The main idea is simple: combine all valid service periods and subtract days that may not count under applicable guidance.
How this calculator works
1) Enter each service period
Add one row per voyage/contract period. Enter sign-on and sign-off dates from your CDC, discharge certificate, or company sea-service letter.
2) Add non-qualifying days
If there were days that should not be counted (for example, extended leave off vessel during a contract), put that value in the non-qualifying field for that row.
3) Calculate totals
The calculator provides:
- Total calendar days served.
- Total deductions entered.
- Net qualifying sea days.
- Approximate years, months, and days.
- Progress against your target days (if entered).
Important sea-time counting points
Counting rules can differ depending on purpose (exam eligibility, endorsement, rank upgrade, STCW course entry, company policy, or administration updates). In many practical logs, sign-on and sign-off are counted inclusively. Still, the final accepted count always depends on official verification.
- Keep your CDC entries consistent with discharge certificates.
- Check vessel name, IMO number, and rank details for each period.
- Avoid overlapping periods across entries.
- Retain supporting letters if there were unusual service patterns.
Example
Suppose you completed two contracts:
- Contract A: 01-Jan-2025 to 30-Jun-2025, non-qualifying 5 days
- Contract B: 15-Aug-2025 to 10-Dec-2025, non-qualifying 0 days
This calculator totals both calendar periods, subtracts deductions, and gives a combined net figure you can compare against a 180-day or 365-day requirement.
Tips before submitting documents
Cross-check every date
Even a single date mismatch can trigger resubmission. Match your entries exactly to official documents.
Keep a digital checklist
- CDC pages scanned clearly
- Discharge certificates in sequence
- Company sea-time letter (if required)
- Course certificates and medical validity
Track your target early
Use the target field in this calculator to monitor how many days are still required. This helps with planning exam windows, joining dates, and document validity timelines.
Frequently asked questions
Does this calculator guarantee DG Shipping acceptance?
No. It is a planning tool. Final acceptance depends on official scrutiny and the latest circulars/notices.
Can I use it for multiple contracts?
Yes. Add as many rows as needed using the “Add Voyage” button.
Can I edit entries later?
Yes. You can change dates/deductions anytime and recalculate instantly.
Final note
Accurate sea-time tracking is one of the most valuable habits for any seafarer. Use this DG shipping sea time calculator regularly after each sign-off so your records stay exam-ready throughout your career.