Chart correction N21/20 — chart 94217

94217 7Ed. 8/4/12 LAST NM N20/20 N21/20 Relocate Buoy “H17” from 31°16′20.3″N 121°50′44.6″E to 31°16′17.1″N 121°50′42.4″E Substitute Depth 12.5 meters for 10.9 meters 31°23′07.8″N 121°50′08.4″E Depth 7.5 meters for 5.9 meters 31°21′17.5″N 121°41′00.8″E Add Depth 8 meters 31°22′25.2″N 121°38′50.3″E and extend depth contour (10-meter) SW to enclose Buoy “No 1” Y, pillar, “X” topmark, Mo(O) Y 12s AIS [Q130.6] 31°24′59.9″N 121°50′04.5″E (6(214)18, 1(6), 15(461), 22(709, 710)19 Tianjin)

Source: NGA U.S. Notice to Mariners · edition: 7Ed. 8/4/12

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