Instructor-ready bridge simulator scenarios for maritime training centres.

• Own ship: COG 000°, SOG 12 kn.
• Target 01: COG 270°, SOG 14 kn.
• Initial range: approximately 5.5 NM.
• Design TCPA: approximately 18 minutes.
• No-action CPA: 0.0–0.2 NM.

North-up geometry schematic, not a radar display. Both projected tracks use the same 18-minute interval.

• Own ship: generic power-driven merchant vessel, COG 000°, SOG 12 kn.
• Target 01: power-driven vessel, COG 270°, SOG 14 kn.
• Initial geometry: target on the starboard bow, relative bearing about 049°, range about 5.5 NM.
• No-action target: CPA 0.0–0.2 NM; TCPA approximately 17–19 minutes at scenario release.
• Environment: daylight, visibility at least 10 NM, wind no more than 10 kn, slight sea and nil or negligible current.

Use the geometry target, not a fixed latitude/longitude pair, as the implementation reference. The full sample includes the pre-run checks.

• Lookout and data quality: maintains a reliable picture using appropriate available means.
• Risk assessment: identifies risk in good time and explains the evidence used.
• Rule application: correctly identifies crossing responsibilities and applies them coherently.

The training centre remains responsible for its approved syllabus and assessment standard.

• When did you first consider the target a collision risk?
• Which indications were most important?
• Was any information given too much or too little weight?
• Which COLREG responsibilities governed the encounter?
• What did being the give-way vessel require you to achieve?
• How did the crossing geometry affect your options?

You are officer of the watch on a power-driven vessel making 000° at 12 kn in open water. Visibility is good. A power-driven vessel is crossing from your starboard side. Maintain a safe navigational watch and manage the situation in accordance with the applicable collision regulations and normal bridge procedures.