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