Chart correction 1851 — chart 1227

Chart 1227 [ previous update 1740/25 ] NAD83 DATUM Insert GfFl.Y.4s ´A´ 42° 57´·03N., 70° 42´·88W. GfFl.Y.4s ´DMON´ 42° 31´·06N., 70° 31´·92W.

Source: UKHO Admiralty Notices to Mariners

Reference information — always verify against official Notices to Mariners before navigation.