Prepare two floats before each trip. They should be weighted with a couple pounds of lead and have enough line to reach bottom, plus an additional 20' or so. Yeah, sure, you've got those wreck numbers plugged into your GPS. But chances are, you still won't see the wreck on the fishfinder without a search. When your electronics verify arrival, toss out the first float. Now the hunt begins: Use the first float as a visual reference and go around it in circles, enlarging each time you go around. When you see the wreck on-screen, drop the second float.