Chart correction 4123 — chart 4237
Chart 4237 [ previous update 3583/23 ] SIRGAS DATUM Insert ´Masts (a) 29° 57´·12S., 71° 19´·60W. Delete depth, 69, close W of: (a) above
Source: UKHO Admiralty Notices to Mariners
Reference information — always verify against official Notices to Mariners before navigation.