A sailing mile builder is a type of sailing trip or course specifically designed to help sailors accumulate nautical miles and gain practical experience at sea. These trips are commonly used by individuals working toward sailing qualifications or certifications, such as those offered by the Royal Yachting Association (RYA), where a minimum number of logged miles is often required. Mile builders typically involve longer passages, offshore sailing, and a variety of conditions, offering crew members the opportunity to enhance their navigation, watch-keeping, and seamanship skills.