MAPTECH® Mount Desert Island to Machias Bay Waterproof Chart. Blue Hill Bay to Machias Bay. The best chart of Mt. Desert Island area! Featuring GPS waypoints for major buoys, courses and distances, fish species, and ramp locations. 24" x 36", scale 1:57,140 with insets. The chart you are viewing is NOT updated weekly and does NOT include all of the latest Notice to Mariners corrections.