STCW Section A-VIII/1 & A-VIII/2 · MLC 2006 Standard A2.3 · IMO MSC.1/Circ.1598 · BRM & ERM
Seafarer Rest Hours, Fatigue Management & Bridge Resource Management (BRM) Guide
Work and rest hour compliance under STCW Code Section A-VIII/1 and MLC 2006 Regulation 2.3 / Standard A2.3, together with Bridge Resource Management (BRM) under STCW Section A-VIII/2 and IMO MSC.1/Circ.1598 (Guidelines on Fatigue), are among the most frequently audited human-element areas in Port State Control, SIRE 2.0, and RightShip RISQ 3.2.
Complementing our Rest Hours Calculator Guide and MLC 2006 SEA & Wage Checklist, this guide explains the rolling 24-hour and 7-day calculation rules, logbook cross-check traps, IMO fatigue mitigation, and BRM / Master–Pilot exchange procedures.
Updated · Written by SeaReady in our own words. Not affiliated with OCIMF, RightShip, CDI, any MoU or any administration — always check the current official documents.
1. STCW Section A-VIII/1 & MLC 2006 Standard A2.3 Rest and Work Limits
Every watchkeeping schedule (`MLC Standard A2.3.10–.11`) and monthly rest record (`Standard A2.3.12`) must satisfy the following convention limits across every rolling 24-hour and 168-hour (7-day) window:
| Rule & Convention Reference | Statutory Threshold | Operational & Inspection Rule |
|---|---|---|
| Minimum Hours of Rest (STCW Section A-VIII/1.2 & MLC 2006 Standard A2.3.5(b)) | ≥ 10 hours in any 24-hour period AND ≥ 77 hours in any 7-day period | Applies to all watchkeeping officers, ratings, and personnel with designated safety, pollution-prevention, and security duties (STCW) and all seafarers under MLC 2006 where the Flag State elects the minimum-rest standard. |
| Maximum Hours of Work (MLC 2006 Standard A2.3.5(a)) | ≤ 14 hours in any 24-hour period AND ≤ 72 hours in any 7-day period | Applies where the Flag State elects maximum hours of work. Even under a maximum-work regime, STCW Section A-VIII/1 still mandates ≥ 10h daily / ≥ 77h weekly rest for watchkeepers and safety/security personnel. |
| Two-Period Subdivision & 6-Hour Continuous Rest Rule (STCW A-VIII/1.3 & MLC A2.3.6) | Max 2 rest periods in any 24h; one period ≥ 6 consecutive hours; ≤ 14h between periods | A third rest fragment in a 24-hour window does NOT count toward the mandatory 10 hours of rest (unless covered by an explicit Flag-authorised STCW A-VIII/1.9 CBA exception). For example, 5h + 3h + 2h equals only 8 countable hours (5h + 3h) and fails the ≥ 6h continuous block rule. |
| Narrow STCW Section A-VIII/1.9 CBA Exception (Where Authorised by Flag) | ≥ 70 hours rest in 7 days (for ≤ 2 consecutive weeks) OR 3 rest periods (1 ≥ 6h, others ≥ 1h) | May only be used if expressly authorised by the Flag Administration and registered Collective Bargaining Agreement (CBA). The 3-period split cannot exceed two 24-hour periods in any 7-day period, and the ≤ 2-week 70h exception requires a pause of at least twice the exception duration before reuse. |
2. Avoiding the 5 Common Rest-Hour Cross-Check Deficiencies
- 1. The Rolling 24-Hour Window Trap (Split Watch Changes): Changing watch patterns (for example switching from sea watches `4-on / 8-off` to port watches `6-on / 6-off`) or shifting rest blocks forward on Day 2 frequently leaves fewer than 10 hours of rest inside an intermediate 24-hour window (e.g., `06:00` Day 1 to `06:00` Day 2) even when both calendar days show `10 hours`. Always run a rolling 24-hour check before approving a watch change.
- 2. Three Rest Fragments in 24 Hours: Under `STCW A-VIII/1.3` and `MLC A2.3.6`, rest may be divided into no more than two periods in any 24-hour window (unless a Flag-approved CBA exception under `STCW A-VIII/1.9` is on board). If a watchkeeper’s rest is split into three blocks (`4h + 4h + 3h`), only the two longest blocks (`4h + 4h = 8h`) count, triggering a non-conformity.
- 3. Interval Between Rest Periods Exceeding 14 Hours: Even if a seafarer gets `10 hours` of continuous rest (`00:00–10:00` on Day 1) and `10 hours` of continuous rest (`02:00–12:00` on Day 2), the 16-hour gap (`10:00` Day 1 to `02:00` Day 2) violates the rule that the interval between consecutive periods of rest must not exceed `14 hours`.
- 4. Mismatched Operational Timestamps: Before signing monthly rest-hour sheets (`MLC A2.3.12`), verify that every officer’s and rating’s logged work periods cover all signed entries in the Deck Log Book, Engine Log Book / UMS Alarm Printer, Oil Record Book Parts I & II, Bunker Delivery Notes, Enclosed Space / Hot Work Permits, and Mooring / Gangway logs.
- 5. Unrecorded Emergency Overrides & Compensatory Rest (`MLC A2.3.9 & A2.3.14`): Never alter a rest sheet to hide an actual work extension. Log the exact hours worked, record the operational reason (e.g., `"Emergency unberthing / thick fog standby per STCW A-VIII/1.8"`), schedule compensatory rest immediately afterwards, and file a Preventive Action review in the SMS if port-turnaround workload caused a non-emergency breach (`ISM Code § 6.2.2`).
3. Bridge Resource Management (BRM), Watchkeeping & Fatigue Mitigation
Under STCW Code Section A-VIII/2, IMO MSC.1/Circ.1598 (Guidelines on Fatigue), and OCIMF / RightShip human-element frameworks, technical rest-hour compliance must be reinforced by disciplined Bridge and Engine Room Resource Management (`BRM / ERM`):
| Watchkeeping & BRM Pillar | Mandatory Standard | Practical Bridge & Engine Team Execution |
|---|---|---|
| Watch Composition & Lookout by Night (STCW Section A-VIII/2 Part 4-1 §§ 13–18) | Dedicated helmsman + dedicated lookout during darkness or restricted visibility | The Officer in Charge of the Navigational Watch (OOW) may act as sole lookout in daylight ONLY after assessing traffic, weather, visibility, and proximity to hazards. From sunset to sunrise or in restricted visibility, a dedicated lookout Rating must be posted on the bridge. |
| Bridge Resource Management (BRM) & Challenge-and-Response (STCW Table A-II/1 & SIRE 2.0) | Shared mental model; closed-loop orders; assertive cross-check regardless of rank | Junior officers and lookouts must be empowered to question any unannounced course alteration, off-track deviation, or unsafe speed (PACE — Probe, Alert, Challenge, Emergency) without fear of reprisal. |
| Master / Pilot Exchange, Pilot Card & Wheelhouse Poster (SOLAS V/23, Res. A.601(15) & A.960(23)) | Completed Pilot Card, permanently displayed Wheelhouse Poster & Manoeuvring Booklet (A.601(15)) | Under IMO Res. A.601(15), present an updated Pilot Card (Appendix 1) and verify the permanently displayed Wheelhouse Poster (Appendix 2) and Manoeuvring Booklet (Appendix 3, ≥ 100 m & all chemical/gas tankers) showing full-load and ballast turning circles, stopping distances, and squat. The presence of a pilot does not relieve the Master or OOW of their duties for the safety of the ship (STCW A-VIII/2 § 49). |
| Bridge Navigational Watch Alarm System (BNWAS — SOLAS V/19.2.2.3 & IMO Res. MSC.128(75)) | 3–12 minute dormant period (Td); Stage 1 bridge visual/audible; Stage 2 & 3 cabin/crew alarms | BNWAS must be operational whenever the ship is underway at sea (key/password-protected under the Master’s control). After the 3–12 min dormant period, Stage 1 flashes a visual indicator on the bridge and after 15 s sounds a bridge audible alarm; if unreset after 15 s, Stage 2 alerts the Master/back-up officer cabins; after 90 s (≤ 3 min), Stage 3 sounds the general crew alarm. |
| Fatigue Risk Management & Operational Manning (ISM Code § 6.2.2 & IMO MSC.1/Circ.1598) | Watch schedules posted (MLC A2.3.10); compensatory rest after emergency call-outs | Under IMO Resolution MSC.353(92) (ISM Code § 6.2.2) and MSC.1/Circ.1598, if port turnarounds, tank cleaning, or short-sea pilotage prevent compliance with STCW/MLC rest hours, the Master must delay operations, step down cargo rates, or request additional manning from the Company. |
Check your rolling 24-hour and 7-day rest blocks offline in the SeaReady Rest Hours Checker, prepare rank handovers in the Crew Handover Tool, and practice STCW watchkeeping and BRM scenarios in Oral Exam Prep.
Questions seafarers ask
What is the "any 24-hour period" rolling window trap in STCW and MLC rest-hour calculations?
Under STCW Section A-VIII/1 and MLC 2006 Standard A2.3, "any 24-hour period" does NOT mean midnight-to-midnight (00:00–24:00). Port State Control software and vetting inspectors slide a rolling 24-hour window backwards and forwards from the start and end of every single work or rest block across the entire month. For example, if a Chief Officer rests 00:00–06:00 and 18:00–22:00 on Day 1 (10 hours) and then works 22:00–08:00 on Day 2 before resting 08:00–18:00, the 24-hour window from 06:00 Day 1 to 06:00 Day 2 contains only 4 hours of rest (18:00–22:00) — a violation of the 10-hour minimum.
How should emergency drills, muster calls, and UMS machinery alarms be recorded on rest-hour sheets?
Under STCW Section A-VIII/1.6 and MLC 2006 Standard A2.3.7–A2.3.9, musters, fire and lifeboat drills, and unexpected machinery call-outs during scheduled rest periods must be logged as work time (never hidden as uninterrupted rest). Whenever a seafarer’s normal period of rest is disturbed by a call-out to work (such as an unattended machinery space UMS alarm), the seafarer must be granted an adequate compensatory period of rest (Standard A2.3.9). Under Standard A2.3.14, the Master may suspend the schedule in an immediate emergency threatening the safety of the ship, persons, or cargo, and must grant compensatory rest as soon as normalcy is restored.
How do PSC officers and SIRE 2.0 inspectors detect falsified rest-hour records?
Inspectors cross-check signed monthly rest-hour sheets (MLC Standard A2.3.12) against timestamped operational logs: Deck Log Book arrival/departure/anchoring times, pilot boarding/disembarkation times, Bunker Delivery Notes (BDN start/finish signatures), Oil Record Book Part I/II entries, Cargo Record Book entries, Permit to Work (enclosed space / hot work) signatures, and ISPS gangway watch logs. If an officer signed a bunker checklist or cargo log at 02:30 while their rest-hour sheet shows "Rest 00:00–06:00", PSC records an MLC/ISM deficiency and SIRE 2.0 records a negative Human/Process observation.
When must the Officer of the Watch (OOW) call the Master to the bridge under STCW Section A-VIII/2?
Under STCW Code Section A-VIII/2 Part 4-1 paragraph 40 and the Master’s Standing Orders, the OOW must notify the Master immediately: (1) if restricted visibility is encountered or expected; (2) if traffic conditions or the movements of other ships are causing concern; (3) if difficulty is experienced in maintaining course; (4) on failure to sight land, a navigation mark, or to obtain soundings by the expected time; (5) if land or a navigation mark is sighted or a change in soundings occurs unexpectedly; (6) on breakdown of the engines, propulsion remote control, steering gear, or any essential navigational equipment, alarm, or indicator; (7) if radio equipment malfunctions; (8) in heavy weather if in any doubt about weather damage; (9) if the ship meets any hazard to navigation (such as ice or a derelict); or (10) in any other emergency or if in any doubt.
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Related guides
- MLC and STCW hours of rest10 hours in any 24, 77 in any 7 days, the rolling-window trap and the STCW exception.
- MLC 2006 SEA, wages & welfare checklistMLC 2006 Reg. 1.4 recruitment fees, Reg. 2.1 SEA terms, Reg. 2.2 wages, A2.5.2/A4.2.1 certificates and 2022 amendments.
- ECDIS & passage planning checklistBerth-to-berth passage planning (A.893(21)), ECDIS safety contour, UKC/squat, ENCs and VDR checks.
- SIRE 2.0 inspection checklistChapter by chapter: what the inspector looks at and the evidence to have ready.
- BNWAS bridge navigational watch alarm system SOLAS guideSOLAS V/19 & MSC.128(75) BNWAS rules, 3–12m dormant cycles, Stage 1–3 alarms, MSC.1/Circ.1474 Manual ON mode and VDR logging.