Crossing the U.S. border by a private, non-commercial pleasure boat in 2026 requires strict adherence to CBP (Customs and Border Protection) protocols. Every person on board must have a valid Passport or a Western Hemisphere Travel Initiative (WHTI) compliant document, such as a NEXUS card or an Enhanced Driver's License. Upon entering U.S. waters from a foreign port (like Canada, Mexico, or the Bahamas), the "Master of the Vessel" must report their arrival immediately to the nearest CBP facility. The most efficient way to do this in 2026 is via the CBP ROAM™ mobile app, which allows for video reporting and digital document submission. You will need to provide the vessel's registration number, the names and dates of birth of all passengers, and a list of any "declarable" items or currency over $10,000. If you are a non-U.S. citizen, you must also have a valid Visa or an ESTA approval. Failure to report your arrival immediately can result in civil penalties starting at $5,000 and potential seizure of the vessel, so the "pro" move is to have your ROAM app ready before you hit the 12-mile limit.