Snap an anchor-retrieval ring and buoy around the anchor line and drive past the anchor at about 45 degrees. The float and ring, which serve as a pulley, will move down the rode. The ball's buoyancy combined with the boat's pull can free a stubborn anchor. Keep driving until you see the anchor ball break the surface astern. At this point, it can easily be pulled in. Note that if the anchor is truly stuck fast, even this technique might not free it. Always use caution when motoring while tethered to an anchor rode.