SANTIAGO, Chile (AP) - An 84-year-old American making his seventh attempt to sail alone around the tip of South America was found tired but alive by the Chilean Navy on Wednesday after his mast broke far from land in the South Pacific.The Chilean Navy located Thomas Louis Corogin on his 32-foot sailboat more than 520 miles (850 kilometers) south of Easter Island, stranded but in relatively stable weather, with ocean swells of about 15 feet (5 meters).Corogin activated his emergency beacon on Tuesday morning, prompting the Navy to send out an Orion search and rescue plane, which searched a vast …