A sailor can work as service staff on large passenger vessels with shared crew and passenger spaces. They can also work as a deckhand underneath a licensed Captain on a vessel small enough to have no security plan.
A Transportation Worker’s Identification Credential (TWIC) allows a sailor to access designated secure and restricted areas without escort. A vessel must have a security plan in order to have these designated areas. T-boats and 6-pack vessels do not require a security plan. As a result, deckhands working aboard T-Boats and 6-pack vessels do not require a TWIC. A deckhand can work as an assistant to the captain in this capacity and perform engine checks and enter the wheelhouse without escort.
A TWIC card is also not required on a towing vessel less than 8 meters in length. However, the exempted towing vessel is not permitted to tow oil barges, seagoing barges or barges carrying dangerous liquids/compounds except in routine shifts in harbors and canal locks or in emergencies. .
Ship Assist Tug Boats
Deckhands on tug boats less than 100 tons that assist docking and tendering vessels do not require TWIC card.
Commercial vessels are exempt from needing a vessel security plan. As a result, fishing vessels do not require the deckhands to have TWIC cards.
General Cargo Vessels Less than 100 GRT
General cargo vessels include oil skimming boats, small equipment shuttle ferries and other auxiliary vessels. Deckhands on these vessels do not need TWIC cards.