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Appendix I, Continued
LIGHT LIST.—A publication tabulating
navigational lights, with their locations,
candlepowers, characteristics, and so forth.
LIGHTSHIP.—A distinctively marked
vessel anchored or moored at a charted
point to serve as an aid to navigation.
LINE OF POSITION (LOP).—A line
indicating a series of possible positions of
a ship as a result of observation or
measurement.
LIST OF LIGHTS.—A publication
containing a description of every light in
the world not located in the United States
or its possessions.
LOCAL APPARENT NOON.—The instant
at which the apparent (true) sun is over the
upper branch of the local meridian.
LOCAL HOUR ANGLE.—Angular
distance west of the local celestial
meridian; the arc of the celestial equator or
the angle at the celestial pole between the
upper branch of the local celestial meridian
and the hour circle of a point on the
celestial sphere, measured westward from
the local celestial meridian through 360°.
LOCAL MEAN TIME.—The arc of the
celestial equator or the angle at the
celestial pole between the lower branch of
the local celestial meridian and the hour
circle of the mean sun, measured westward
from the lower branch of the local celestial
meridian through 24 hours; local hour
angle of the mean sun, expressed in time
units, plus 12 hours.
LOCUS.—All possible positions of a point
or curve satisfying stated conditions.
LONGITUDE.—Distance east (E) or west
(W) of the prime meridian, which runs
through Greenwich, England.
LOOKOUT.—A man stationed as a visual
watch.
LORAN.—An electronic navigational
system by which hyperbolic lines of
position are determined by measuring the
difference in the time of reception of
synchronized pulse signals from two fixed
transmitters.
LUBBER’S LINE.—A reference line on
any direction-indicating instrument,
marking the reading that coincides with the
heading.
LUNAR TIME.—Time based upon the
rotation of Earth relative to the Moon.
MAINMAST.—Second mast aft from the
bow.
MAIN-TRUCK.—The highest part of the
mainmast.
MANEUVERING BOARD.—A polar
coordinate plotting sheet devised to
facilitate the solution of problems
involving relative movement.
MANEUVERING SHIP.—A ship the
movements of which are defined relative to
a given ship called the reference ship.
MASTER STATION.—The governing of
two or more synchronized transmitting
stations.
MASTHEAD.—The top of a mast.
AI-7
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