Maptech waterproof chart. Detail Coverage of Mt Desert Island on one side is a combination of 3 NOAA charts. The reverse side has Coastal coverage from Isle au Haut east to Mt. Desert Rock and Winter Harbor and north to Ellsworth. Detail up the Union River to Ellsworth and of the Casco Passage. GPS and Loran Waypoints make it easy to set up your electronics. Large Place Names make towns easy to find Information from 4 NOAA charts; 13316, 13318, 13313 and 13312. GPS Datum