Use the navigation bar in the upper left corner of the map to zoom in and zoom out on Graham Lake. You can see satellite images of Graham Lake 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 Graham Lake. 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!