Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?
Official USCG Answer & Rule Citation
Correct Answer: Option A — A
Safe water marks, or mid-channel buoys, are designated by a spherical topmark. According to IALA buoyage standards, this distinct shape prevents confusion with lateral and cardinal marks, indicating navigable water all around the aid.
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