You realise your radar, ECDIS and a visual bearing disagree. What is the best first action?

A. Continue and sort it out later

B. Stop adding risk, say you have lost the picture, and rebuild from independent fixes

C. Switch off the radar

D. Trust the ECDIS only

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

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