Chart correction N18/21 — chart 37226
37226 19Ed. 3/9/13 LAST NM N17/21 N18/21 Delete Buoy “NE 16” 54°00′36″N 8°36′24″E Change Buoy “NE 20 Trischenflinge 2” to “TF 2a” R, spar 54°00′32″N 8°39′49″E (See N7/21) Add Buoy “NE 16/B 22” R, spar, can topmark 54°00′23″N 8°36′37″E Depth 5.9 meters Obstn [K41] 53°51′08″N 8°54′33″E Buoy “NE 18” R, spar 53°59′45″N 8°38′00″E (12(1610)21 Hamburg)
Source: NGA U.S. Notice to Mariners · edition: 19Ed. 3/9/13
Reference information — always verify against official Notices to Mariners before navigation.