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- Apprentice Mate Steersman (Great Lakes and Inland (Any Appropriate Tonnage)) »
- Q420 - Navigation General: Great Lakes and Inland
162. In both regions of the IALA buoyage system, which topmark shown in illustration D022NG below is used on a special mark?
Choice D is correct; special marks in both IALA Regions A and B are distinguished by an optional yellow X-shaped topmark.
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