Sea service, often called sea time, is vessel experience submitted for evaluation toward a captain credential. The evaluator needs an accurate account of the boat, dates, duties and waters—not just a total of years spent fishing.

Start by recording what actually happened, then separate missing evidence from questions about what qualifies. The National Maritime Center, or NMC, evaluates the evidence for the endorsement you request. An organized record helps you ask precise questions without making an eligibility decision yourself.

Start with one boat at a time

Use a separate private record for each boat. Collect its identifying details, the dates you were aboard, the work you actually did, the waters and who can confirm that work. Keep the source of each entry, such as a log or employment record, with the dates it supports.

Use logs, employment records, calendars and other records made at the time to investigate dates. Mark uncertainty instead of replacing it with plausible-looking entries. A boat photograph may help recall a date; it does not automatically satisfy an official evidence requirement.

Keep conflicting records together with the question they raise. For example, if a calendar names the day but not the boat or duties, use it to investigate that entry rather than copy a complete-looking day from another record.

A useful planning entry might read: “Boat A; recorded dates attached; deck duties; inland waters; owner contact held privately; signature still needed.” This is an invented organizer example, not a qualifying service claim.

Separate time aboard from accepted service

Record what actually happened: riding as a passenger, maintenance ashore, travel to a job or duties aboard the boat. Do not count them all as the same kind of qualifying experience. The official instructions define how hours, days, duties and experience on particular waters can be credited.

An endorsement describes the role and limits on the requested credential. Its route describes the relevant water category. Service for one route or endorsement does not automatically settle a different one.

Use the current official checklist and service-form instructions for what to record and how it can be credited. Keep the requested endorsement and route with the record so the question stays attached to the application you mean. The worksheet here does not calculate eligibility.

Keep overall and recent service separate

Recent service is the qualifying experience inside a specified recent period. It is only part of the evidence, not a replacement for the overall service requirement.

The recorded source review describes the September 2025 recency-policy change and its seven-year window, compared with the older three-year shorthand. That is a dated source finding, not an eligibility decision for your record. Check the actual current checklist for the required days and other conditions before working out the recent-service part of your application.

Keep separate working subtotals with the dates and basis attached. Label unresolved entries and show which instructions each working total uses. Don't combine figures from old school notes and a newer checklist without resolving the difference; a larger total doesn't answer a missing-signature or route question.

Find who can attest to the work

Attestation means the required person confirms the recorded service. Find out early who can sign or supply that confirmation and which current form or service-letter instructions apply. Having dates in your own notes is different from having the evidence the evaluator requires.

If the boat was sold or an employer closed, collect what remains and ask NMC about acceptable evidence for that situation. Don't assume self-signing, notarization or a message from a friend automatically fills the gap.

For your own vessel, follow the actual ownership-evidence and attestation instructions too. Keep drafts separate from the version supplied for confirmation and the signed final record. If a correction is needed, keep the change and its supporting evidence visible and follow the appropriate confirmation instructions; don't edit someone else's attestation to make the copies match.

Reconcile the record before relying on a total

Compare logs, calendars and service forms for the same periods. Flag overlapping dates, unclear duties, missing boat details or signatures, and waters you cannot identify. If the same date appears for two boats, keep the question visible instead of counting it twice without review.

There are three different next actions:

  • Actual service with missing evidence needs documentation and proper confirmation.
  • Recorded experience that may not fit the intended endorsement needs evaluation.
  • Experience you have not gained requires legitimate future work or practice that qualifies under the rules.

Give each gap the matching next action, responsible person and evidence or answer needed. One entry may need both a missing confirmation and an answer about how the duties apply; keep both questions open until resolved. A course purchase or a larger total written at the top of a form cannot solve all three problems.

Keep a routine you can maintain

After actual service, record the details while they are fresh. Periodically review them with the person who will attest, resolve gaps and back up the file securely. When an entry changes, update the affected working totals and retain why it changed. Keep the packet version submitted and any later request or replacement linked, so a copied total doesn't lose its evidence trail.

Use the sea-time preparation worksheet for a summary and open questions. It is not an official form and does not need private identity documents. Use the responsible official process for the application evidence.

If you need more experience, the working-without-a-boat lesson helps frame a conversation about duties, training, pay and service records before taking a job.