Operation Blue Water

WAR GAMES · LINUX · difficulty 5 · ~40 min · 19 steps

Contacts that are not there, a position that jumps, and a chart display that believes all of it.

Briefing

02:20, transit through a narrow strait, and the bridge is arguing with itself. The chart display shows nineteen contacts converging on the vessel. Four of them are broadcasting man-overboard beacons, which the master is obliged to respond to. The radar sees open water. The position on the chart has jumped twice and the autopilot has already corrected for it. You are the technical officer. The bridge crew need to know which of their instruments to believe, and they need it before the next course alteration.

Objectives

• Decode the AIS feed and establish which contacts are fabricated
• Test the integrity of the serial navigation sentences
• Check the NMEA 2000 bus that carries steering and engine data
• Prove how the crew network reaches the navigation network
• Fall back to instruments that cannot be injected into

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