Chart correction 4579 — chart 3340
Chart 3340 [ previous update 1428/25 ] UNDETERMINED DATUM Delete fog signal, Whis, at buoy 49° 03´·6N., 140° 24´·5E. Wk42/25 II 2.30
Source: UKHO Admiralty Notices to Mariners
Reference information — always verify against official Notices to Mariners before navigation.