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- Q182 - Navigation General: Near Coastal
89. Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?
A safe water mark displays a single spherical topmark, as shown in option A. This distinguishes it from isolated danger marks (two balls) and cardinal marks (two cones), which indicate specific dangers or the direction of safest water, respectively. Safe water marks signify navigable water surrounding the mark.
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