Chart correction 4770 — chart 4917

Chart 4917 [ previous update 4447/21 ] NAD83 DATUM Insert the accompanying note, AUTOMATIC IDENTIFICATION SYSTEMS, centred on: 42° 29´·26N., 123° 44´·40W.

Source: UKHO Admiralty Notices to Mariners

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