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Appendix I, Continued
COMMISSION PENNANT.—Narrow red,
white, and blue pennant with seven stars,
flown at the main-truck of a ship in
commission.
COMPASS.—An instrument for
determining courses steered and bearings
by indicating the magnetic or true north
and the ship’s head.
COMPASS HEADING.—A heading
relative to compass north.
COMPASS POINTS.—The 32 divisions of
a compass at intervals of 11 1/4°.
COMPUTED ALTITUDE.—Altitude of
the center of a celestial body above the
celestial horizon at a given time and place
as determined by computation, table,
mechanical device, or graphics.
CONSOL.—An electronic navigational
system providing a number of rotating
equisignal zones that permit determination
of bearings from a transmitting station by
counting a series of dots and dashes and
referring to a table or special chart.
CONTOUR.—A line connecting points of
equal elevation or equal depth.
CUMULONIMBUS.—A massive cloud
with great vertical development, the
summits of which rise in the form of
mountains or towers, the upper parts often
spreading out in the form of an anvil.
CUMULUS.—A dense cloud with vertical
development, having a horizontal base and
dome-shaped upper surface, exhibiting
protuberances.
CURRENT.—Water in essentially
horizontal motion. A hypothetical
horizontal motion of such set and drift as
to account for the difference between a
dead-reckoning position and a fix at the
same time.
DAY BEACON.—An unlighted beacon.
DEAD RECKONING.—Determination of
position by advancing a previous position
for courses and distances.
DECCA.—An electronic navigational
system by which hyperbolic lines of
position are determined by measuring the
phase difference of synchronized
continuous wave signals.
DECLINATION.—Angular distance north
or south of the celestial equator and a point
on the celestial sphere, measured
northward or southward from the celestial
equator through 90°, and labeled N or S to
indicate the direction of measurement.
DEGAUSSING.—Neutralization of the
strength of the magnetic field of a vessel
by means of suitably arranged electric coils
permanently installed in the vessel.
DEGREE.—A unit of circular measure
equal to 1/360th of a circle.
DEPTH.—Vertical distance from a given
water level to the bottom.
DEPTH OF WATER.—The vertical
distance from the surface of the water to
the bottom.
AI-3
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