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Essential Navigation revision module 3 of 10

IALA

Buoyage and Marks

IALA Region A lateral marks, cardinal marks, safe water marks, isolated danger, and special marks.

lateral markscardinal marks

4 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain iALA Region A lateral marks, cardinal marks, safe water marks, isolated danger, and special marks.
  • Apply lateral marks to a realistic onboard situation.
  • Recall the core check: lateral marks guide channels and harbour approaches.

A self-guided revision companion that explains essential concepts, then helps you practise and test them. It supports—but does not replace—recognised instruction, practical training, assessment or certification. Access is a one-time payment, not a subscription.

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Lesson routeWhy Buoyage Matters0/1 read

Lesson 1 of 1

Why Buoyage Matters

Buoyage turns the chart into visible navigation. Marks show channels, hazards, safe water, special areas, and directions into harbour.

Essential Navigation learners need recognition plus action: identify the mark, connect it to the chart, and decide which side or area is safe.

  • Lateral marks guide channels and harbour approaches.
  • Cardinal marks indicate where safer water lies around a hazard.
  • Safe water marks indicate navigable water around the mark.
  • Special marks identify an area or feature, not necessarily safe water.
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