Another hint, put a piece of 3/4" plywood across the bow of your boat, stack the rocks on that and you can drop them off by hovering over your spot, then raising the plywood. Don't load so many rocks as to make it too heavy, or to sink your boat when you raise the wood. Ask me how I know...
LOL.
On the other hand, a sunken boat with rocks in it would make outstanding habitat. Just saying....... ;-)
