Nate, I call it the biner on a stick trick. First, find a stick that is long enough to get to the boat. Then duct tape the spine of a biner to the end of the stick so that the side where the gate opens is at the end of the stick and the side where the gate pivots is towards the rescuer. This makes it so you can push down on the biner with the stick to open the gate on a grab loop, and when you pull the stick towards you the biner closes around the grab loop or rescue bar. Biner should be duct taped well enough so that when you apply downward pressure on the biner that the gate opens instead of the biner twisting around in loose duct tape. Attach a rope to the biner before you go fishing. For shorter distances the entire operation can be handled by one person. For longer distances like this one with precarious footing we had one person holding the rope, and one person backing me up holding my rescue vest belt so I wouldn't slip in (might have had two folks backing me up at one point), and one person working the stick. Once the biner is latched in, you can pull on the stick and it should come out of the duct tape. Then you have your rope binered to the boat and can pull it in.
Had a couple folks tell me that they didn't think it would work, but it does! Can also be a big help for getting to pinned boats in the middle of strong current. Good reminder to always have some gorilla tape in the crew. Its also a good reminder to have good grippy footwear for rescue work. I have the 5.10 canyoneers and they definitely helped me get solid footing on the wet rock.