During your oral exam you're asked what 'integrity' means in the context of a GNSS receiver, as distinct from accuracy. What is the correct distinction?

A. They mean the same thing — integrity is just another word for accuracy

B. Integrity is a feature only found on ECDIS, not on standalone GPS receivers

C. Integrity refers only to the physical condition of the GPS antenna

D. Accuracy describes how close the computed position is to the true position; integrity is the system's ability to provide timely warnings when the position solution should not be trusted (e.g. due to a satellite fault or poor geometry) — a receiver can be inaccurate without warning you (a genuine integrity failure), which is more dangerous than a known, bounded inaccuracy

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