2015 New York Safe Boating - 4
BOATS AND MOTORS
Draft - the vertical distance from the bottom of the
underside (the keel) to the water line. The draft determines
the minimum depth of water in which your boat can
operate-the larger the draft, the deeper the water must be
for the boat to operate without running aground.
If you're new to boating, there are many new terms,
procedures, and rules to learn. This lesson will help you
become familiar with the words and terms that describe parts
of the boat and directions on the boat. Many of these are
critical to safety. We will discuss a few of the most important
terms in this lesson.
Freeboard - the vertical distance from the waterline to the
upper edge of the boat's sides. Boats with low freeboard
may take on water in rough conditions or when crossing
another boat's wake.
Centerline - an imaginary line drawn from the bow to the
center of the stern along the middle of the boat.
Length or Length Overall (LOA) - the distance from
one end of the boat to the other end. It does not include
outboard motors, brackets, or other attachments.
Waterline length - the length of the boat from end to end
when it is in the water
Beam - the width of the boat at its widest point.
Trim - The angle at which a boat rides in the water. A boat
may be trimmed so it rides even, down at the stern, or down
at the bow.
Displacement-the weight of water that the boat must push
out of the way to float. As you add gear or passengers, the
boat's displacement increases and the boat sinks lower into
Knot - a measurement of speed on the water equal to one
nautical mile per hour (1.15 mph).