Chart correction N24/21 — chart 44179
44179 3Ed. 5/2/15 LAST NM N47/20 N24/21 Change Buoy to Y, spar 59°07′29″N 18°24′20″E Buoy to Y, spar 59°06′32″N 18°22′57″E Buoy to Y, spar 59°06′02″N 18°21′58″E (856(15847)21 Norrkoping)
Source: NGA U.S. Notice to Mariners · edition: 3Ed. 5/2/15
Reference information — always verify against official Notices to Mariners before navigation.