Question 1

True or False: if a navigational mark expected along the planned track is not sighted or detected on radar when due, this should be treated as a possible indication the vessel is off its intended track, and checked immediately rather than assumed to be a temporary equipment or visibility issue.

Accepted Answer

True MESHKA's investigation found that missing navigational marks went unnoticed during the passage that ended in grounding. An expected mark not appearing exactly when and where predicted is one of the most basic cross-checks of position — it should immediately prompt a position check by an independent method, not be dismissed.

Question 2

You're preparing a passage plan for a coastal leg in a yacht drawing 3.2m. At one point the chart shows a least depth of 3.8m at chart datum. What MUST you check before finalising this leg?

Accepted Answer

The tidal height at the time of transit to confirm sufficient under-keel clearance Charted depths are referenced to chart datum (often LAT), so you must add the predicted tidal height for your transit time to get the actual depth, then compare to your draft plus a safety margin to confirm UKC.

Question 3

During your watch the ECDIS gives a "safety contour crossing" alarm. What is the correct response?

Accepted Answer

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 A safety contour alarm indicates the vessel may be approaching water shallower than the set safety contour. It must be investigated against the route and charted information, with avoiding action taken and the Master informed as appropriate — never simply silenced.