Chart correction 19/21 — chart 54421
54421 6Ed. 3/17/01 LAST NM 7/21 19/21 Delete Buoy 36°40′24″N 29°01′27″E Add Buoy BRB, pillar, double ball topmark, Fl(2) W 5s [Q130.4] 36°40′05″N 29°05′19″E Buoy BRB, pillar, double ball topmark, Fl(2) W 10s [Q130.4] 36°40′22″N 29°01′23″E (12(49)21 Istanbul)
Source: NGA U.S. Notice to Mariners · edition: 6Ed. 3/17/01
Reference information — always verify against official Notices to Mariners before navigation.