GLOSSARY-4
SUMP: A pit or well into which water is drained.
SUPERSTRUCTURE: A fl ying bridge or other struc-
ture that extends above the deck.
SWELL: Long, large wave that does not break.
SWIM PLATFORM: Low platform, used for boarding,
found at the back of the boat.
TOPSIDE: To go to the uppermost deck.
TRANSOM: The stern cross section of a yacht.
UNDERWAY: A vessel that is not moored, docked,
at anchor or aground.
V-BERTH: Small galley consisting of a folding table,
tabletop stove, and a basin.
V-BOTTOM: A hull with the bottom section that is in
the shape of a “V”.
V-DRIVE: A drive system that has the output of the
engine facing forward and is coupled to a transmis-
sion, which then changes the output aft.
VESSEL: A boat, ship, yacht, or another craft used
to travel on water.
WAKE: The movement of waves caused by the
boat’s hull.
WATERLINE: The line of water on the hull when the
boat is afl
oat and at rest.
WEATHER DECK: A deck with no overhead pro-
tection.
WHARF: A landing place or pier where ships may
tie up and load or unload
WINCH: A mechanism used to increase the pull on
sheet lines.
WINDLASS: A device used to raise and lower an
anchor.
YAW: To go off course.
YACHT: A vessel used for pleasure instead of
work.
SEACOCK: A positive action shut-off valve con-
nected directly to the hull seawater intake valve.
SHAFT: The long round member that connects the
transmission to the propeller.
SHAFT LOG: A fi
tting at the hull bottom where the
propeller shaft penetrates the hull. The shaft log
permits rotation of the shaft while simultaneously
preventing water from entering the hull.
SHEER: The top of the hull from bow to stern. The
point in which the hull meets the deck.
SHEER STRAKE: The upper edge of the hull im-
mediately below the deck.
SHEERLINE: (1) The curve of the boat when being
viewed from the side. (2) A turn off course due to
poor helmsmanship or trouble steering.
SOLE: Term used to refer to the cockpit fl oor
or fl oor
of the cabin.
SPRING LINE: A pivot line used in docking or to
prevent the yacht from moving forward or astern
while made fast to a dock.
STANCHION: The metal posts that help hold up the
rails on a boat.
STARBOARD: Looking forward, the right side of a
yacht from bow to stern.
STARBOARD BOW: Looking forward, the front, right
side of the bow.
STARBOARD QUARTER: Looking forward, the right
rear section of a yacht.
STATEROOM: A bedroom for guest or the cap-
tain.
STEM: The leading edge of a yacht’s hull.
STERN: The rear of a yacht.
STRINGER: A fore and aft continuous member
located in the bottom of the hull used to provide
longitudinal strength.
STRUT: A propeller shaft support that is below the
hull. The main strut is a large strut that is mounted
immediately forward of the propeller. An intermediate
strut is smaller than the main strut and is mounted
between the main strut and the shaft log.
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