Glossary of Nautical Terms
14-3
HULL – The body of the boat.
HYPOTHERMIA – A physical condition where the body loses heat faster than it
can produce it.
IN-LINE FUSE – A type of protective fuse located in the power wire of a direct
current (DC) circuit usually near the battery.
KEEL – The lowest portion of the boat; extends fore and aft along the boat’s
bottom.
LIFE JACKET– A buoyant wearable jacket that when properly used, will support a
person in the water, also see PFD.
LIST – Leaning or tilt of a boat toward the side.
MAKING WAY – Making progress through the water.
MARINE CHART – Seagoing maps showing depths, buoys, navigation aids, etc.
MOORING – An anchor, chain or similar device that holds a boat in one location.
NAVIGATION AID – Recognizable objects on land or sea such as buoys, towers
or lights which are used to fix position to identify safe and unsafe waters.
NMMA – National Marine Manufacturers Association.
NO-WAKE SPEED – The speed at which a boat travels to produce an
imperceptible wake.
PFD – A buoyant personal flotation device used to support a person in the water,
also see Life Jacket.
PLANING HULL – A hull designed to lift, thereby reducing friction and increasing
efficiency.
PORPOISE – A condition in which the bow bounces up and down.
PORT – (1) The left side of a boat when facing the bow. (2) A destination or
harbor.
PRIVILEGED BOAT – Term used for the boat with the right-of-way.
RIGHT-OF-WAY – Term for the boat that has priority in meeting or crossing
situations. The stand-on or privileged boat.
RULES OF THE ROAD – Regulations for preventing collisions on the water.
SEACOCK – A thru-hull valve or shut off on a plumbing or drain pipe between the
vessel's interior and the sea.
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