Chart correction N20/23 — chart 52046
52046 22Ed. 09/19/15 LAST NM N12/23 N20/23 Change Buoy to Y, pillar, "X" topmark, Fl(4) Y 10s 36°35′47″N 4°29′36″W Buoy to Y, pillar, "X" topmark, Fl(4) Y 10s 36°36′04″N 4°29′28″W Buoy to Y, pillar, "X" topmark, Fl(4) Y 10s 36°36′01″N 4°29′23″W Buoy to Y, pillar, "X" topmark, Fl(4) Y 10s 36°35′50″N 4°29′40″W (See N09/23) (16(134)23 Cadiz)
Source: NGA U.S. Notice to Mariners · edition: 22Ed. 09/19/15
Reference information — always verify against official Notices to Mariners before navigation.