Lifting a Jon Boat out of the water

I have 3 piles how do I rig the piles using pulleys to lift a john boat up out of the water? The boat will stay above mean high tide. I want to use pulleys and a boat winch from an elevated deck which is 8 feet above the water. I can reach one pile from the elevated deck.

" The seas was angry that day, my friend"
George C.

make a frame across teh top of the pilings
rig your winch on the frame with a lifting jig to balance the load
1 lifting point, and maybe some kind of strap at 1 corner to stop it from moving

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