Which alternative means of navigation does MGN 719 name for use when GNSS is degraded or denied?

A. Only celestial navigation

B. Radar navigation and position fixing, visual navigation, celestial navigation, dead reckoning and estimated position, and independent sensor systems

C. Only AIS-derived positions

D. Only the pilot's portable unit

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?

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

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

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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