Chart correction N49/20 — chart 52186
52186 4Ed. 4/13/13 LAST NM N40/20 N49/20 Add Buoy (mooring) [Q40] 36°47.98′N 10°31.50′E (Plan) Change Period of buoy “No 2” to 5s 36°47′33.2″N 10°21′08.3″E (9(1), 11(1)20 Bizerte)
Source: NGA U.S. Notice to Mariners · edition: 4Ed. 4/13/13
Reference information — always verify against official Notices to Mariners before navigation.