You're on lookout duty during a bridge watch. You notice the vessel seems to be passing closer to the shore than you'd expect from previous trips on this route. What should you do?

A. Check the chart yourself before saying anything to confirm you're right

B. Report what you've observed to the OOW immediately and clearly, even if you're not certain it matters — a second pair of eyes catching something early is the entire point of having a lookout

C. Say nothing — the OOW is navigating and will have a reason for the course

D. Wait until the end of the watch to mention it in case it turns out to be nothing

A. The tidal height at the time of transit to confirm sufficient under-keel clearance

B. The yacht's fuel consumption for that leg

C. The colour of the seabed shown on the chart

D. Only the distance to the next waypoint

A. Assess the situation against the planned route and charted depths, take action to maintain safe water, and inform the Master if there is any doubt

B. Ignore it — ECDIS alarms are frequently false and can be left running

C. Switch the ECDIS to standby mode and navigate by GPS position alone

D. Acknowledge and silence the alarm immediately so it does not distract the helmsman