Maptech waterproof chart. A great combination of 4 charts makes it easy to see this complex area. Travel from Vinylhaven completely thru either Eggemoggin Reach or Deer Isle Thorofare on one side. Large Place names make towns easy to find. Reverse side covers Blue Hill Bay to Northwest and Southwest Harbors Includes Detail for Blue Hill Harbor. Waypoints for GPS and Loran. Information from 4 NOAA charts; 13309, 13305, 13313, and 13316. GPS datum