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You could remove the boat by using the magic wand - just make sure that with any selections you are doing, you have the "contiguous" selected. This will cause it to select only contiguous pixels and not pixels that are anywhere on the canvas. You could also create a clipping mask so that the effects you apply will only apply to what falls within the clipping mask. I usually prefer to select the object and do a "layer via copy", then work on the cutout of the object and lay it back on it. It gives me more options - but the "right" way to do it really would be with a clipping mask.