A new system is installed onboard.
A supplier creates a remote connection for support, the commissioning is completed and the vessel returns to operation.
Years later, the equipment is still running. The supplier may have changed, the responsible person may have left and nobody remembers that the connection still exists.
On 27 August, the UK National Cyber Security Centre warned that it has observed increased targeting of operational technology across several sectors. This activity has already caused limited real world disruption.
The warning was not directed specifically at shipping, but the message is highly relevant onboard.
OT systems can become exposed through legacy connections, unmanaged assets and simple configuration mistakes.
At Sea IT, this is not a new concern. We have worked with secure integration of onboard OT systems for years.
The goal has always been to make operational data available where it creates value, while maintaining clear boundaries, controlled access and full visibility of how systems communicate.
Modern vessels depend on connected systems for engine monitoring, cargo operations, performance data, remote support and communication with shore.
The connection itself is not necessarily the risk. The risk appears when access is introduced without clear ownership, limitations or monitoring.
A temporary access route can become permanent. An old router may remain installed after a project. A supplier account may continue to work long after the original purpose has disappeared.
The NCSC warns organisations not to assume that OT is inaccessible from the internet without first verifying it.
Every connection should therefore have a defined purpose, a responsible owner and a process for removal when it is no longer required.
Connecting OT safely requires more than installing a firewall between two networks.
Shipowners need a clear and consistent structure for how systems are separated, accessed and monitored across the fleet.
This principle has shaped how Sea IT approaches vessel infrastructure. BlueCORE provides a standardised onboard foundation where IT, OT and external connections can be managed within clearly defined boundaries.
This allows operational systems to exchange the information they need without exposing more of the vessel environment than necessary.
Suppliers can receive controlled access when required, while the shipowner retains visibility and control.
A consistent setup across the fleet also makes it easier to identify unusual communication, remove outdated access and apply the same security principles from one vessel to the next.
Map
Identify every onboard system, communication path and external connection.
Separate
Create clear boundaries between business IT, management systems and operational technology.
Control
Ensure every remote connection has a defined purpose, an owner and appropriate monitoring.
OT integration has supported maritime operations for years, and it can be done securely.
Connecting operational technology is not the risk. Connecting it without visibility and control is.
