Chart correction N47/20 — chart 44087
44087 1Ed. 6/30/12 LAST NM N41/20 N47/20 Add Sunken mine [N23.1] enclosed by purple composite-line circle, radius 0.4 mile, centered 54°22′55″N 12°05′29″E Sunken mine [N23.1] enclosed by purple composite-line circle, radius 0.4 mile, centered 54°22′49″N 12°07′40″E (41(36)20 Hamburg)
Source: NGA U.S. Notice to Mariners · edition: 1Ed. 6/30/12
Reference information — always verify against official Notices to Mariners before navigation.