“12 nautical miles” is an offshore distance used as a practical boundary between coastal and open-water operations. In maritime security discussions, it often marks the point where land-based cellular coverage becomes unreliable and a ship may switch to satellite or other shipboard connectivity. That makes the line important not just for navigation, but for the trust boundary around communications.
In cyber security, this threshold matters because services, devices, and management portals may behave differently once a vessel is beyond coastal infrastructure. A cruise eSIM, for example, may activate only after crossing this boundary, placing provisioning, account access, and onboard network handling into a new threat model. Attackers may target the app, portal, or credentials used to manage the service, while defenders focus on segmentation, strong authentication, and secure provisioning so passenger connectivity does not expose operational systems.