Chart correction N31/23 — chart 24053

24053  18Ed.  10/30/21  LAST  NM  N21/23  N31/23 Relocate Buoy "Km 16" from 34°37′06.8″S  58°11′35.3″W to  34°37′03.0″S  58°11′33.0″W and add legend "SYNC" (See N09/23) Add Color Y to buoy "Km 13.5"   34°36′36.0″S  58°13′07.2″W (See N05/23) (5(53)23 Montevideo)

Source: NGA U.S. Notice to Mariners · edition: 18Ed. 10/30/21

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