Biofouling Rules Push Owners to Continuous Hull Records

From Voluntary Guidance to Mandatory Recordkeeping

Biofouling management is shifting from a matter of good seamanship to a matter of regulatory compliance. According to a report published by Maritime Executive (sponsored content from Greensea IQ), while the IMO’s biofouling guidelines remain voluntary, regional authorities are increasingly turning the practice into law. California already mandates a biofouling management plan, a record book, and an annual report. Australia and New Zealand inspect vessels for fouling on arrival. Brazil has introduced its own plan-and-record-book requirement, backed by penalties, that also demands logging of every inspection and in-water cleaning event.

The common thread across these jurisdictions is documentation. It is no longer enough to keep a hull clean — operators must be able to produce a verifiable, on-demand history showing hull condition, inspection dates, cleaning activity, and outcomes.

Why a Clean Hull Alone No Longer Satisfies Regulators

Proactive hull maintenance has long been the more economical choice from a fuel-consumption standpoint. The source notes that it is now also becoming the path of least resistance through regulation, precisely because regular cleaning generates the data trail authorities want to see. A cleaning event with no accompanying record carries little weight with an inspector or port authority.

Many operators are exposed here not through negligence but through fragmented processes. Hull records are typically pieced together from separate diver inspections, cleaning contractors, and individual port calls — an episodic approach that fails to produce a coherent, continuous picture of hull condition over time.

Insurers and P&I Clubs Are Watching Too

The push for documentation isn’t purely regulatory. P&I clubs have backed the move toward stronger record-keeping because a documented hull history serves as evidence — whether the issue is a fine for non-compliant cleaning at a port, a dispute over hull condition, or a claim tied to an operational delay. A record built into routine operations holds up far better than one reconstructed retroactively under pressure.

A Security Dimension, Too

The report also points to a security angle: through 2025 and into 2026, several tankers were damaged by limpet mines attached to their hulls, generally after calls at or trade with particular ports, with devices timed to detonate after the vessel had already departed. In at least one case, the mines were discovered only because the port required a hull inspection on arrival. While this is a narrow, trade-specific threat, it underscores a broader truth: the hull is the largest surface on the vessel yet remains one of the hardest to inspect routinely, and one of the most neglected.

What This Means for Owners and Managers

For technical superintendents, this converging pressure from regulators, insurers, and security concerns raises a practical question: can your current hull management process produce a defensible, continuous record on short notice, or does it rely on stitching together disconnected reports from divers, contractors, and port agents after the fact? The direction of travel suggests that ad hoc documentation will increasingly fail to satisfy port state inspectors, class surveyors, and underwriters alike. Owners who treat inspection and cleaning as a single, continuously logged workflow — rather than two separately scheduled tasks — will be better positioned when a regulator, insurer, or security officer asks for evidence.

Toward Continuous, Purpose-Built Solutions

The article describes how technology providers are responding to this gap. Greensea IQ’s EverClean platform, originally built as an autonomous hull-grooming system, has been engineered to record hull condition as it works, building a position-referenced dataset pass by pass rather than treating cleaning and record-keeping as separate tasks. The same platform can also operate purely as an inspection vehicle, free-flying like a traditional ROV before attaching for close mapping, and its architecture supports additional payloads such as hull-thickness sensors.

Whatever platform or process an owner chooses, the underlying lesson from this shift in regulation, insurance practice, and security incidents is consistent: hull management is becoming a matter of continuous, verifiable record. Independent condition surveys, inspection reports, and third-party verification will increasingly form part of the paper trail owners and managers need to demonstrate compliance, satisfy underwriters, and protect vessels against emerging threats.

Reviewed by Ibrahim Halil Ceylan, Marine Surveyor at Apeks Marine.