ISO 4891:2024

Overview

ISO 4891:2024 - Ships and marine technology - Interoperability of smart applications for ships - defines operational and performance requirements for onboard smart applications. The standard addresses documentation, process management, connection and data collection via human‑machine interfaces (HMI), maritime IoT technologies and related systems. It specifies methods for implementing open smart network applications and describes a smart logbook that supplements ISO 21745 and is subject to the same security requirements (see Annex B).

ISO 4891:2024 establishes three incremental equipment classes:

• 4891‑compliant (Clauses 5–7)
• 4891.A‑compliant (Clauses 5–7 + Annex A)
• 4891.B‑compliant (Clauses 5–7 + Annexes A and B)

Key technical topics and requirements

ISO 4891 covers the technical building blocks and implementation guidance required for interoperable shipboard smart systems:

• Smart application network architecture: definitions for 4891 components such as message broker, service discovery, unit registry and 4891‑units.
• Messaging and data encoding: standard message structures, headers, JSON encoding for value types and dictionary/message types.
• Communication transports and APIs: guidance and requirements for HTTP‑APIs, UDP broadcasts, MQTT/message broker usage, direct messaging and message relaying.
• Service discovery & unit registry: methods for discovering services and tracking unit information across the ship network.
• Trust, encryption and PKI: public key infrastructure, root and unit certificates, digital signatures and data encryption for secure messaging.
• Compatibility and testing: detailed compatibility implementation, test methods for UDP broadcasts, HTTP servers/clients, message inspection and equipment classification testing.

Practical applications and who uses it

ISO 4891 is intended for organizations building, integrating or operating smart systems on ships:

• Shipbuilders and naval architects integrating smart equipment into new builds
• Equipment manufacturers and IoT vendors implementing 4891‑compliant devices
• Systems integrators and software developers creating onboard applications, HMIs and middleware
• Ship operators and fleet managers deploying smart logbooks, condition monitoring, remote diagnostics, predictive maintenance and operational data collection
• Classification societies, regulators and cybersecurity teams assessing compliance and security of shipboard smart networks

Practical deployments include interoperable smart logbooks, onboard IoT sensor networks, integrated bridge and machinery room HMIs, remote monitoring gateways and data exchange ecosystems that reduce vendor lock‑in and improve operational efficiency.

Related standards

• ISO 21745 - smart logbook (security requirements referenced in ISO 4891 Annex B)
• Other maritime and cybersecurity best practices may be applicable when implementing 4891‑compliant systems.

Keywords: ISO 4891:2024, interoperability of smart applications for ships, smart ship applications, maritime IoT, message broker, MQTT, HTTP API, UDP broadcast, PKI, encryption, smart logbook.