Chart correction N31/21 — chart 37166

37166 4Ed. 1/11/14 LAST NM N29/21 N31/21 Substitute Platform (lighted) “HZB” [L2] for depth 18.4 meters 52°15.5′N 4°05.1′E Add Platform (lighted) “HZA” [L2] HORN, enclosed by purple composite-line circle, radius 500 meters, centered 52°19.2′N 4°02.6′E (26(225)21 Den Haag)

Source: NGA U.S. Notice to Mariners · edition: 4Ed. 1/11/14

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