Chart correction N34/23 — chart 37231

37231  19Ed.  11/12/11  LAST  NM  N32/23  N34/23 Delete Buoy   53°42′21″N  8°18′17″E Buoy "F1"   53°42′26″N  8°17′55″E (See N29/18) Add Buoy "31a" G, conical   53°42′07″N  8°18′51″E Buoy "31/F2" GRG, pillar, cone topmark, Fl(2+1) G 15s   53°42′32″N  8°17′46″E (28(1240)23 Hamburg)

Source: NGA U.S. Notice to Mariners · edition: 19Ed. 11/12/11

Reference information — always verify against official Notices to Mariners before navigation.