"Red, right, returning." "Even red nuns have odd black cans." To the mariner entering harbor from sea these expressions keep ships, their occupants, and cargo "out of harm's way." Remember the expressions and follow the signs and you will navigate safely home. 

Navigation, the art or science of moving precisely from one location to a second, has been practiced by humans since the dawn of civilization. With increasing sophistication men and women travelers have used various navigational aids, all of which are signs, to arrive at their destinations successfully. When travel was by foot, cart, wagon, or beast of burden, points of land served as the principle signs. It might have been a mountain peak, a river, or some rock formation. Each navigational aid told the traveler direction and dista…