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Appendix I, Continued
OFFICIAL VISIT.—A formal visit of
courtesy requiring special honors and
ceremonies.
OMEGA.—An electronic navigational
system.
OSCILLOSCOPE.—An instrument for
producing a visual representation of
oscillations or changes in an electric
current.
PARALLAX.—The difference in the
apparent direction or position of an object
when viewed from different points.
PARALLEL.—A circle on the surface of
Earth parallel to the plane of the equator
and connecting all points of equal latitude;
a circle parallel to the primary great circle
of a sphere or spheroid.
PASSING HONORS.—Honors, except gun
salutes, that are rendered by a ship when
ships or embarked officials or officers pass
close aboard.
PEAK.—The topmost end of the gaff from
which the ensign is flown while a ship is
under way.
PELORUS.—A dumb compass, or a
compass card (called a pelorus card)
without a directive element, suitably
mounted and provided with vanes to permit
observation of relative bearings, unless
used in conjunction with a compass, to
give true or magnetic bearings.
PHONETIC ALPHABET.— A system of
words that represents each letter of the
alphabet.
PILOTING.—Navigation involving
frequent or continuous determination of
position or a line of position relative to
geographical points to a high order of
accuracy.
PIPE THE SIDE.—A ceremony conducted
at the brow of a ship in which sideboys are
paraded and the boatswain’s pipe is blown.
PLAN POSITION INDICATOR.—A
radarscope that has a sweep that originates
in the center and moves to the outer edge
of the scope and presents an overflow of a
given area.
PLOTTING SHEET.—A blank chart,
usually on the Mercator projection,
showing only the graticule and a compass
rose so the plotting sheet can be used for
any longitude.
POLAR DISTANCE.—Angular distance
from a celestial pole.
POSITION.—A point defined by stated or
implied coordinates, particularly one on the
surface of Earth.
PRESSURE.—Force per unit area. The
pressure exerted by the weight of Earth’s
atmosphere is called atmospheric or, if
indicated by a barometer, barometric
pressure.
PROLONGED BLAST.—A blast on the
whistle of from 4 to 6 seconds duration.
PROPAGATION.—A transmission of
electromagnetic energy.
AI-9
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