POOP DECK: A partial deck above the main deck
located all the way aft.
The keel is the backbone of the ship.
FORWARD WELL DECK: Forward part of the
main deck between the upper deck and forecastle.
AFTER WELL DECK: Between the upper deck
and the poop deck.
What is the forward edge of the stem called?
GALLERY DECK: First deck or platform below
the flight deck.
QUARTERDECK: The quarterdeck is not an
actual deck, but an area designated by the commanding
officer for the conduct of official functions. It is the
station of the officer of the deck in port and usually is
The vertical distance from the keel to the
on the main deck at the starboard gangway.
waterline of a ship is known by what term?
deck level to another. They may or may not be
covered by hatches.
The number of compartments into which the decks
and bulkheads subdivide the ship's interior area
The first level above the main deck is called
depends upon how many the ship's mission will allow.
the 02 level.
Since the compartments are both above and below the
waterline, when the degree of compartmentation on a
ship is increased, the ship's resistance to sinking is also
ship that allows for more effective control of
fires and floods.
· Allows for more effective control of fires and
· Strengthens the ship's structure.
· Helps defend against a chemical, biological, and
· Segregates various ongoing activities.
Learning Objective: Recall compartment number
designations for ships built after March 1949.
· Provides underwater protection by the use of
Compartments on Navy ships are numbered for
tanks and voids to help control the ship's
identification following a standard system. Each
buoyancy and stability.
compartment has a four-part number separated by
Most large combatant ships have an armor belt to
hyphens; the four parts indicate the following:
protect the vital machinery spaces. Armor plating may
The deck upon which the compartment
reduce the ship's speed or have an adverse effect on the
operation of the ship. Aircraft carriers are a prime
example where excessive armor plating would
Location of the compartment by frame.
interfere with the ship's operation by reducing the
The position of the compartment relative
ship's speed. Therefore, armor plating on aircraft
to the ship's centerline.
carriers is reduced, while compartmentation is
increased to compensate for the reduction of armor.
The compartment use.