I am a light to guide and warn the unwary, to point out to them the path of safety, a

I am a light to guide and warn the unwary, to point out to them the path of safety, and to enable them to avoid the marks of foul and dangerous ground. I am a small white buoy, which indicate, at night, the position of certain emetics, and in the day-time I am a conspicuous object to warn the mariner from coming into contact with them. I am placed in a position of considerable importance, and I am therefore obliged to remain where I