I've watched propeller screws going over my head while I was pulling an inner tube with a dive flag. I think the stink boaters thought it was a racing pylon.
I'm sure it helps but there's always an idiot. /shrug
Be safe. 
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Those grand fresh-water seas of ours - Erie, and Ontario, and Huron, and Superior, and Michigan, - possess an ocean-like expansiveness...They contain round archipelagoes of romantic isles...they have heard the fleet thunderings of naval victories...they know what shipwrecks are, for out of sight of land, however inland, they have drowned full many a midnight ship with all its shrieking crew. --from Moby Dick
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