The of Great Britain and its dominions defines a as one that is or more at the waterline and is in commercial use for sport or pleasure, while not carrying cargo or more than 12 passengers and carrying a professional crew. The code regulates the equipping of such vessels, both at sea and in port—including such matters as crew duty times and the presence of a helicopter on board. The code has different levels of standard for vessels above and below 500 gross tons. Such yachts may be considered and are more commonly at or more in length. Other countries have standards similar to LY2.