Chart correction 1706 — chart 4250
Chart 4250 [ previous update 565/23 ] PSAD56 DATUM Insert depth, 145 , enclosed by 20m contour 43° 26´·7S., 74° 05´·0W.
Source: UKHO Admiralty Notices to Mariners
Reference information — always verify against official Notices to Mariners before navigation.