IALA & Danish marks study overview

Use IALA Region A and apply buoyage direction in Danish waters.

Practise observation and judgement using sailing scenarios. Interactive questions and your device-local progress load when JavaScript is available.

Study points

• Denmark uses IALA Region A. Verify the direction of buoyage and local chart information for the waterway.
• Region B reverses the Region A lateral colours: green is to port and red to starboard when entering from seaward.
• Cardinal marks indicate the safe-water quadrant relative to the mark; combine topmark, colour and light character.
• The emergency wreck mark uses blue and yellow vertical stripes and a blue/yellow alternating light to alert mariners to a newly identified wreck.
• The direction of buoyage is defined and shown for the waterway; do not assume it from destination or first sighting.
• Use multiple cues and current chart information. A light alone may not identify a mark uniquely.

Educational revision only. Check current official rules, charts and publications before navigating.