Chart correction N18/23 — chart 37231
37231 19Ed. 11/12/11 LAST NM N17/23 N18/23 Add Buoy "Warnstelle" Y, conical [Q130.6] 53°46′14″N 8°05′29″E (27-28(1230)22 Hamburg)
Source: NGA U.S. Notice to Mariners · edition: 19Ed. 11/12/11
Reference information — always verify against official Notices to Mariners before navigation.