Customs brokers clear goods through customs and to their destination on behalf of importer and exporter clients. Shipbrokers buy and sell cargo space on ships and buy and sell ships, yachts and other watercraft on behalf of clients. This unit group also includes other brokers, not elsewhere classified, who negotiate commercial transactions, logistics or other services between parties on behalf of clients. They are employed by customs, ship or other brokerage establishments or may be self-employed.