While the boats in the 34th America’s Cup may struggle to make the starting line, watches dedicated to sailing, and racing in particular, have arrived in greater numbers than ever before. The so-called regatta watch, which assists a skipper in timing the start so that the boat crosses the line immediately after—but not before—the gun sounds has become a specialty complication area, with enough differences between the various mechanisms to be interesting. Like all mechanical timepieces, the practical applicatio…