Chart correction N37/23 — chart 54424
54424 2Ed. 09/22/18 LAST NM N01/21 N37/23 Add "Unexploded ordnance" area [Kp] bound by purple dashed-line circle, radius 0.2 mile, centered 36°47′16.0″N 28°16′18.4″E (19(98)23 Istanbul)
Source: NGA U.S. Notice to Mariners · edition: 2Ed. 09/22/18
Reference information — always verify against official Notices to Mariners before navigation.