87% The average score for this test.
Not primarily used to assist in navigation, special buoys indicate special areas or features such as military exercise zones, recreation zones, traffic separators etc. They're the same in both IALA buoyage systems and are characterised by their yellow colour. Their lights, when they have them, are yellow and can have any rhythm apart from those used by isolated danger, cardinal, safe water, lateral and emergency wreck buoys.
Taking a test can be a great way to build on what you have learnt already and build confidence before taking a formal qualification test. The Special Marks test consists of 5 questions randomly chosen from a selection.