Chart correction N26/21 — chart 54388
54388 1Ed. 4/23/16 LAST NM N47/20 N26/21 Add Depth 10.4 meters 38°26′49.0″N 27°09′03.0″E Depth 11.9 meters 38°26′51.8″N 27°09′23.0″E Depth 7.4 meters 38°26′35.3″N 27°09′57.7″E Depth 11.2 meters 38°26′30.8″N 27°09′54.5″E (2(8)21 Istanbul)
Source: NGA U.S. Notice to Mariners · edition: 1Ed. 4/23/16
Reference information — always verify against official Notices to Mariners before navigation.