Chart correction N50/23 — chart 37231

37231  19Ed.  11/12/11  LAST  NM  N48/23  N50/23 Add Buoy "Bu 6a" YBY, spar, double cone topmark points together [Q130.3]   53°41′44″N  8°21′13″E (See N48/23) (46(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.