Chart correction N21/20 — chart 24057
24057 6Ed. 2/11/12 LAST NM N51/19 N21/20 Add Depth 5 meters, blue tint and enclosing depth contour (5-meter) centered 34°55′11″S 56°15′02″W Depth 0.9 meter enclosed by depth contour (1-meter) centered 34°53′17″S 56°13′10″W Depth 4.9 meters 34°55′13″S 56°14′32″W and extend depth contour (5-meter) and blue tint SW to enclose (See N20/19) (Plan) Add Depth 5 meters, blue tint and enclosing depth contour (5-meter) centered 34°55′10.8″S 56°15′01.8″W Depth 0.9 meter enclosed by depth contour (1-meter) centered 34°53′16.8″S 56°13′10.2″W Depth 4.9 meters 34°55′13.2″S 56°14′31.8″W and extend depth contour (5-meter) and blue tint SW to enclose (URY CH 41)
Source: NGA U.S. Notice to Mariners · edition: 6Ed. 2/11/12
Reference information — always verify against official Notices to Mariners before navigation.