The Evolution of Global Safety: From IMO to ISO Adoption

How maritime and land-based safety signs converged into one shared visual language. · 3 min read

From Fragmented Icons to a Shared Visual Language

For most of the twentieth century, the way you recognised a safety sign depended heavily on where you were standing. A seafarer boarding a vessel saw one set of icons for evacuation routes and life-saving equipment; a shopper walking through a mall saw something quite different for the same concepts. The relationship between the International Maritime Organization (IMO) and the International Organization for Standardization (ISO) is the story of how that split closed — and why a "Fire Extinguisher" symbol now looks the same on a cruise ship as it does in an office tower.

Why the Industries Diverged

Historically, maritime and land-based sectors developed their safety symbols independently. The same underlying concept — "Lifeboat" at sea, "Emergency Exit" on land — was represented by different graphics, created by different bodies, under different standards. For a world of increasingly international crews and passengers, this was more than a design inconsistency. It was a safety problem.

The IMO eventually took the view that safety signage only works if recognition is instinctive. A passenger under stress should not have to translate between two symbolic vocabularies. Rather than continue developing a separate maritime icon library in parallel, the IMO chose to align with an existing global resource: the ISO 7010 catalogue of graphical symbols.

The Regulatory Turning Point

That alignment was formalised in IMO Resolution A.1116(30), which requires safety signs on new vessels to follow ISO 7010 graphical conventions. The practical effect is straightforward: whether a person is in a shopping centre, a factory, or aboard a ferry, the core safety icons they encounter are drawn from the same library.

Timeline of Safety Sign Standardisation

How Shipboard Signs Are Grouped

Shipboard safety signs under the current framework fall into a set of functional groups. Each group addresses a different role in keeping people safe on board, and the visual treatment of each follows the colour and shape rules laid out in ISO 3864-1.

• Means of escape — marking routes to safety and designated evacuation paths.
• Emergency equipment — showing where first aid supplies and portable safety gear are stored, and how to use them.
• Life-saving systems and appliances — identifying the location and operation of lifeboats, life rafts, and related equipment.
• Fire-fighting equipment — locating extinguishers, hoses, and related fire response tools.
• Prohibition signs — communicating actions that are not permitted.
• Hazard warning signs — flagging dangers that occupants need to avoid.
• Mandatory action signs — indicating instructions that must be followed.
• Safety and operating instructions — procedural guidance intended for trained crew members.

The prohibition, warning, and mandatory categories are built on the same P, W, and M families used throughout ISO 7010 — another example of the two worlds converging on one shared grammar.

Why This Matters for Procurement Today

For anyone specifying signage for a vessel, a port facility, or a cross-border industrial site, the practical takeaway is simple: ISO 7010 is now the common denominator. Specifying ISO-aligned symbols ensures that signs meet maritime regulatory expectations under IMO Resolution A.1116(30) while remaining instantly recognisable to land-based workers, visitors, and passengers. The era of choosing between a "maritime version" and a "shore version" of the same icon is largely over.