The new SOLAS 2026 mandatory lost container reporting requirements under Chapter V Regulations 31 and 32 mark a major shift from voluntary guidance to strict legal obligation. Effective 1 January 2026, every ship carrying one or more freight containers — or that observes drifting containers at sea — must immediately report the incident to nearby vessels, the nearest coastal State, and the flag State. Non-compliance is now a clear Port State Control deficiency that can lead to detention. With 576 containers lost at sea in 2024 alone (World Shipping Council data) and a decade-average of over 1,200 losses per year, these rules directly address navigational hazards, environmental risks, and cargo claims. This practical guide for Ship Masters and Cargo Officers explains exactly what you must report, when, how, and what documentation to keep ready. Start a free trial of Marine Inspection to integrate SOLAS lost container reporting into your SMS with ready-to-use templates and digital incident logging.
Why SOLAS Made Lost Container Reporting Mandatory in 2026
Containers lost overboard create serious dangers to navigation, damage marine ecosystems, and trigger complex cargo claims. Until 1 January 2026 reporting was voluntary and inconsistent. IMO Resolution MSC.550(108) changed that. Masters (or the company if the ship is abandoned) must now report without delay. Flag States feed verified data into the IMO’s GISIS database for global tracking. Port State Control officers will actively verify your procedures during inspections. Book a Marine Inspection demo to see how the platform turns this new obligation into a simple, documented workflow.
Exact SOLAS 2026 Reporting Obligations – Step by Step
Here is what you must do the moment containers go overboard or you spot drifting ones:
Table 1: Information Required in Every Lost Container Report (SOLAS V/32)
Use this exact checklist when preparing your message.
| Information Element | Details to Include | Mandatory? |
|---|---|---|
| Type of Report | “Loss of freight container(s) from a ship” or “Observation of freight container(s) drifting at sea” | Yes |
| Ship Identity | IMO number, ship name, call sign, MMSI | Yes |
| Time & Position | Date/time (UTC) and exact or estimated position of loss or sighting | Yes |
| Number of Containers | Number lost or estimated number (mark as “final” once verified by inspection) | Yes |
| Container Description | Size (20/40 ft etc.), type (standard, reefer, open-top), whether empty or loaded | To the extent known |
| Dangerous Goods | Whether any containers contain dangerous goods and UN numbers if known | Yes (if applicable) |
| Additional Information | Weather/sea state, circumstances of loss, any cargo spill observed | Recommended |
Table 2: Before vs After SOLAS 2026 – What Changed for Masters
| Aspect | Before 1 Jan 2026 | From 1 Jan 2026 (Mandatory) |
|---|---|---|
| Reporting Obligation | Voluntary “danger message” under old V/31 | Strict legal duty — no delay allowed |
| Who Must Report | Only the ship that lost containers | Any ship that loses containers OR observes drifting ones |
| Recipients | Generally nearby ships only | Nearby ships + nearest coastal State + flag State |
| Flag State Role | No formal requirement | Must upload final report to IMO GISIS |
| PSC Enforcement | Rarely checked | Active verification during inspections — deficiency or detention possible |
Practical Checklist for Ship Masters & Cargo Officers
Use this before every voyage and keep it in your bridge folder.
How Marine Inspection Helps You Comply with Lost Container Reporting
Marine Inspection gives Masters and Cargo Officers digital tools purpose-built for the new SOLAS rules: pre-loaded reporting templates, one-tap incident logging with photos and GPS, automatic SMS updates, and audit-ready records that PSC officers accept instantly. Schedule your personalised demo and see how easy compliance becomes.
