The fourth leg of the Velux Five Oceans Singlehanded Round the World Race is underway as the four competitors set off from Punta del Este, Uruguay bound for Charleston, South Carolina.  The racers are currently sailing at north at around ten knots all within 3 nautical miles of each other.   Brad Van Liew, the American sailing  Le Pingouin, the winner of the last three legs, is again in the lead, but separated from two of the competitors by only one nautical mile.