Know what depends on what
An asset list becomes useful when it records function, ownership and dependencies, not just serial numbers.
In 30 seconds
- Record the system’s purpose, location, owner and supported software version.
- Map connections and shared dependencies such as power, GNSS time, authentication and backups.
- Start with approved documentation and passive observations; active scans can disturb sensitive OT.
Make it concrete
Two bridge displays share one position source. Draw that dependency: two screens do not necessarily mean two independent measurements.
- 01Asset
- 02Dependency
- 03Consequence
Check your understanding
Can two systems fail together because they share a dependency?
- Record the system’s purpose, location, owner and supported software version.
- Map connections and shared dependencies such as power, GNSS time, authentication and backups.
- Start with approved documentation and passive observations; active scans can disturb sensitive OT.
Go to the source
- Course notes · Nguyễn Văn Thư · An ninh mạng và khả năng chống chịu an ninh mạng trên tàu biển ↗
- NIST SP 800-82 Rev.3 · Guide to Operational Technology Security ↗
Sources reviewed: 13.09.2026