I wouldn't bother with this detector because of problems others have had with it. There are better choices available to you at near the same price from Whites, Tesoro, Minelab and Garrett. Heck, even the old Fisher 1280 is better made. Fisher is supposed to be coming out with a new CZ21, an upgraded CZ20 for the water.
If you can swing it, the Minelab Excal 800 or 1000 is the way to go.