For travel between the U.S. and Canada via ferry in 2026, the documentation requirements fall under the Western Hemisphere Travel Initiative (WHTI). Most adult travelers should present a valid Passport, Passport Card, or an Enhanced Driver's License (EDL) (available in states like NY, MI, MN, VT, and WA). A standard "REAL ID" is insufficient for crossing the international border. If you are a member of a trusted traveler program, a NEXUS card is also highly recommended. For children under the age of 16, a birth certificate (original or copy) is usually acceptable in lieu of a passport when traveling by sea or land. Non-U.S. or non-Canadian citizens will typically need a valid passport and may require an Electronic Travel Authorization (eTA) or a visa depending on their nationality. Additionally, if you are bringing a vehicle, ensure you have your registration and proof of insurance ready for customs officers at the terminal.