Chart editions / corrections
| * 17550 | Chart: 93, 937 | 
| Sweden. Skagerrak. W of Nord-Koster. Hållviksgrund. Cardinal spar buoy in new position. | |
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| Move | north cardinal spar buoy with top mark approx. 450 m to the west to position | 58-53,53N | 010-54,68E | 
