Ten miles south of Norfolk, Vonnie took the Tourguide map from the Rambler glove compartment and spread it out across her knees. Plotting rough coordinates on a Portsmouth Nags Head axis, she ignored the printed mileage chart and gauged the distance south with a makeshift caliper of thumb and index fmger. “We'reway ahead of schedule, you know,” she said apprehensively, tracing a horizontal crease from the Outer Banks to the Blue Ridge Mountains. “Hours.