TANGO - - Letter T in the Marine Radio Alphabet.

THWARTSHIPS - At right angles to the centerline of the marine vessel.

TIDE - The periodic rise and fall of water level in the oceans.

TILLER - A bar or handle for turning a marine vessel's rudder or an outboard motor.

TOPSIDES - The sides of a vessel between the waterline and the deck; sometimes referring to onto or above the deck.

TRAWLER - A recreational or fishing vessel originally designed for the purpose of operating a trawl, a type of fishing net that is dragged along the bottom of the sea. However now also a cruising recreational boat that resembles a fishing trawler.

TRANSOM - The stern cross-section of a square sterned marine vessel.

TRIM - Fore and aft balance of a marine vessel.