Chart correction N20/23 — chart 37120
37120 4Ed. 09/19/15 LAST NM N17/23 N20/23 Substitute Depth 14.8 meters for depth 15.6 meters 51°29.9′N 2°49.2′E Add Depth 14.9 meters 51°30.3′N 2°50.6′E Depth 12.8 meters 51°30.9′N 2°53.4′E (See N08/22) (9(128)23 Oostende)
Source: NGA U.S. Notice to Mariners · edition: 4Ed. 09/19/15
Reference information — always verify against official Notices to Mariners before navigation.