Chart correction N31/21 — chart 54339
54339 9Ed. 3/28/09 LAST NM N18/20 N31/21 Add Depth 20 meters Wk [K26] with legend “Historic Wreck (See Note)” 37°59′43.8″N 23°33′32.5″E Note “HISTORIC WRECKS Historic wreck sites are prohibited within a radius of 300 meters from unauthorized interferences. Diving, fishing, anchoring, and salvage is prohibited.” 38°03′06.2″N 23°24′37.4″E (5(82)21 Athens)
Source: NGA U.S. Notice to Mariners · edition: 9Ed. 3/28/09
Reference information — always verify against official Notices to Mariners before navigation.