Chart correction N20/21 — chart 51141

51141 1Ed. 1/29/11 LAST NM N37/20 N20/21 Delete Buoy “No 17 CN” 38°29′06.7″N 8°49′14.5″W Add Buoy “No 16 CN” R, pillar, can topmark, Fl(3) R 9s 38°28′48.7″N 8°49′00.1″W Buoy “No 19 CN” G, pillar, cone topmark, Fl G 4s 38°28′56.8″N 8°49′07.8″W Buoy “No 18 CN” R, pillar, can topmark, Fl R 4s 38°28′40.0″N 8°48′47.3″W Buoy “No 21 CN” G, pillar, cone topmark, Fl(2) G 6s 38°28′30.6″N 8°48′36.2″W Buoy “No 17 CN” G, conical, Fl(3) G 9s 38°29′06.3″N 8°49′13.9″W (3(163)21 Lisboa)

Source: NGA U.S. Notice to Mariners · edition: 1Ed. 1/29/11

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