Use the navigation bar in the upper left corner of the map to zoom in and zoom out on Upper Mayville Pond. You can see satellite images of Upper Mayville Pond by clicking on "Satellite" or "Hybrid" in the upper right corner of the map.
Use your mouse to get GPS coordinates for any spot on Upper Mayville Pond. Simply click and drag the red arrow to the spot you are interested in and the geocodes (latitude + longitude) will appear in the boxes above - it's that easy!