I wanted to highlight another section that is overlooked by some. If he was warned before he went into that channel, he is certainly in violation of the law based on the above clause.(5) Divers must make reasonable efforts to stay within 300 feet of the divers-down flag on all waters other than rivers, inlets, and navigation channels. Any person operating a vessel on waters other than a river, inlet, or navigation channel must make a reasonable effort to maintain a distance of at least 300 feet from any divers-down flag.