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SPRING LINE - A pivot line used in docking, undocking,
or to prevent the boat from moving forward or astern while
made fast to a dock.
STARBOARD - Looking forward, the right side of a boat.
STARBOARD BEAM - The right-center of a boat.
STARBOARD BOW - When facing the bow, the front right
side.
STARBOARD QUARTER - When looking forward, the right
rear section of the boat.
STEERAGEWAY - The lowest speed at which a vessel
can be controlled by the steering wheel.
STEM - The leading edge of a boat's hull.
STERN - The back of a boat.
STRINGER - A fore and aft continuous member used to
provide a vessel longitudinal strength.
STRUT - A propeller shaft support that is below the hull.
SUMP - A pit or well into which water is drained.
SUPERSTRUCTURE - Deck houses and other structures
extending above the deck.
THWART - A seat or brace running laterally across a boat.
THWARTSHIPS - At right angles to the centerline.
TILLER - A bar or handle for turning a boat's rudder, or
motor.
TOPSIDE - To go up to the top deck.
TRANSOM - The stern cross-section of a square sterned
boat.
TRANSVERSE - Across the vessel; athwartships.
TRIM - Fore and aft balance of a boat.
TROUGH - 1. The valley that exists between waves. 2. A
trough is the opposite of a ridge in that it is an elongated
low-pressure area extending out from a low. A trough
normally indicates unsettled weather.
TUMBLE HOME - The opposite of flare. The shape of the
hull as it moves outboard going down from the gunwale to
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the waterline or chine.
UNDERWAY - Movement. Usually referring to a vessel
proceeding forward.
V-BOTTOM - A hull with the bottom section in the shape
of a "V."
V DRIVE - A drive system that has the output of the en-
gine facing forward and coupled to a transmission. The
prop shaft is then coupled to the transmission.
WAKE - Moving waves, track or path that a boat leaves
behind it when moving across the water.
WATER LINE - The line of the water on the hull when the
vessel is afloat.
WATCH - A 4 hour duty period while at sea.
WAVES - Waves are periodic disturbances of the sea's
surface, caused by wind, seaquakes, and the gravitational
pull of the moon and the sun.
WAVE GRADIENT - A wave's slope or angle from trough
to crest with respect to the horizon.
WAVE HEIGHT - From the bottom of a wave's trough to
the top of the crest.
WEATHER DECK - A deck with no overhead protection.
WET EXHAUST - This term refers to an exhaust system
where the cooling seawater is mixed with the exhaust
gases just after the riser. This mixture is then ejected
through the drive or ports located in the transom or hull
sides.
WHARF - A man-made structure bounding the edge of a
dock and built along the shoreline.
WHIPPING - The act of wrapping the end of a piece of
rope with small line, tape or plastic to prevent it from fray-
ing.
WINDLASS - A device used to raise and lower the an-
chor.
WINDWARD - Toward the direction from which the wind
is coming.
YAW - 1. To swing off course, as when due to the impact
of a following or quartering sea. 2. Any motion about a
vertical axis.
Glossary
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