Good times....

From http://miamivice.wikia.com/wiki/St._Vitus_Dance

The St. Vitus Dance is a sailing yacht and home of James "Sonny" Crockett. Moored in Miami's luxurious Miamarina (now known as Bayside Marketplace), the sailboat rarely seemed to leave its berth, acting more as a floating apartment than a means of transport or recreation. Such an apparently wasteful means of living was very befitting of Crockett's wealthy, drug-dealing undercover personality, although the yacht also provided a convenient means of escaping the city to the relative safety of the open ocean if necessary.

The St. Vitus was portrayed by three different yachts during the course of the show's five seasons. In the pilot episode, Crockett lived on a Cabo Rico 38 sailboat, which changed to an Endeavour 40 once the show was picked up as a series. At the start of Season 2, the boat changed to a larger Endeavour 42, although some footage of the Endeavour 40 was still used in some episodes (likely stock footage filmed during Season 1). By Season 3, the Endeavour 42 was the only boat seen, and would remain so for the rest of the series. It was never stated on the show if these boats were supposed to be the same yacht, or whether they were supposed to be three different vessels each christened the St. Vitus Dance -- however, the use of both the 40 and the 42 during Season 2 implies the former.