Chart correction 3401 — chart 4122
Chart 4122 [ previous update 2400/26 ] WGS84 DATUM Insert + Obstn 22° 20´·159N., 113° 57´·832E. Delete Gf;Fl(5)Y.20s A01 (a) 22° 17´·253N., 114° 04´·879E. Automatic Identification System, AIS, at light-buoy (a) above
Source: UKHO Admiralty Notices to Mariners
Reference information — always verify against official Notices to Mariners before navigation.