Page 261 - NAVAL SCIENCE 3 TEXTBOOK

GLOSSARY Or :\'AVAL SKILLS TER}'[S 267

gyrocompass-an electromechanical compass aligned with true mean time-time based on the relationship of the mean Sun with
north by means of a spinning gyroscope. Earth, that is, a make-believe Sun that travels around Earth at the
equator at a constant speed of 15 degrees per hour.
gyro repeater-a remote readout of the position of a ship's gyro-
compass card. mine barrage-a field of mines sowed in a water area to discourage
the passage of shipping through the area.
hatch-horizontal opening in the deck of a ship or boat.
mine countermeasures (MCM)-the branch of naval warfare that
hawsepipe-heavily built pipes in a ship or boat hull through
includes all methods, procedures, and techniques fer preventing
which an anchor cable rllns on its way from the deck to the water.
or reducing damage to ships fronlmines.
hawser-a thick line used t'Or towing or high-line transfer.
naval surface gunfire support-gunfire from ships in support of a
homing torpedo-a torpedo that uses a self-contained guidance
land operation.
system usually based on sound detection or terminal guidance.
navigation-the art and science of directing a ship or aircraft from
hUll-the body or shell of a ship or seaplane.
one position to another.
ICBM-intercontinental ballistic missile.
officers country-the living quarters of officers aboard ship.
lEO-an improvised explosi\'e device such as a remote-controlled
parallel ruler-a hinged two-part pair of straightedges designed
bomb.
to permit transfer of a parallel line from one place to another on
incendiary-----causing or capable of causing fire. a plot.
keel-central longitudinal beam of a ship from which the frames piloting-navigation near land using landmarks, aids to naviga-
and hull plating rise. tion, and depth soundings.
knot-a nautical speed unit equivalent to 1 nautical mile (2,000 point defense-the defense of a portion of a perimcter surround-
yards) per hour. ing a ship or outpost by a weapon system capable of interdicting

latitude-the angular distance of a position on Earth's surface any threat that might materialize at that location.
measured from the equator northward or southward through 90 port-seagoing term for left; an observation ·window on a vessel.
degrees.
pursuit curve-a curved path followed by a missile that homes in
light water-a fire fighting liquid chemical compound designed to on and eventually overtakes and intercepts a target.
form a surt~lCe film to smother fires.
pyrotechnics-ammunition, flares, or fireworks used tel' signaling,
line of position {LOP)-a locus of points along which a position illuminating, or marking targets, or for setting them on fire.
must be located.
radioactive fallout--dustlike radioactive windbarne particles, pro-
longitude-the angular distance of a position on Earth's surface duced by the explosion of a nuclear device or weapon.
measured from the prime meridian eastward or westward through
range of guns-the distance a projectile from a gun can be fired.
180 degrees.
range of tide-the vertical distance between high and low tide lev-
loran-an electronic navigation system in which the time differ-
els in a body of watcr.
ence in the reception of pulse signals originated at a master and
RAP-rocket -assisted projectile; the incorporation of a rocket
one or more secondary radio stations is used to obtain lines of
motor in the base of a gun projectile to extend its range.
position; the intersection of two such lines forms a fix.
relative wind-direction and speed at which a wind is blowing rel-
magnetic signature-the magnetic field associated with a metal
ative to a vessel.
ship.
repair Ilarty-a group of specialists organized to control damage
main battery-the largest or most powerfi.tl armament of a ship or
and make repairs throughout a ship during battle.
aircraft.
rifled gun-a gun with groovcs inside the barrel that cause an exit-
mainmast-the second mast of a ship with two or more m.asts,
ing projectile to spin in order to provide stability during its flight.
except ·when the first is taller.
rifling-spiral grooves cut inside a gun bore to impart spin to a
maneuvering board-a printed sheet used in solving relative
projectile being fired.
motion problems.
RIM-a military designation tel' a ship-launched air-intercept
marlinspike seamanship-skill with rope, line, and other deck gear.
guided missile.