Yachting Glossary - U

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una rig	Boat rigged with a single sail.
under bare poles	Having no sails up. In heavy weather the windage of the mast and other spars can still be enough to move the boat.
under the lee	On the lee side of an object, protected from the wind.
under way	A vessel in motion is under way.
undertow	Strong offshore current extending to the shore.
unfurl	To unfold or unroll a sail. The opposite of furl.
union jack	A small flag representing the nationality of the boat.
upwind	Object nearer the direction the wind is coming from than the observer.
uphaul	A line or wire used to control the height of a spinnaker pole

WORLD of YPI