The main purpose of this legislation, known as the Noncontiguous Shipping Competition Act, is to modify existing laws regarding shipping in the United States. Specifically, it aims to exempt certain noncontiguous trade routes from the coastwise laws, which govern the transportation of goods between U.S. ports. This change is intended to enhance competition in shipping and potentially lower costs for consumers and businesses involved in trade between noncontiguous areas, such as islands or territories not directly connected to the mainland.