Navigation Flashcards
Agonic Lines
a type of isogonic line which are drawn through places of no variation.
Airspeed
is the speed of an aircraft relative to the air. There are several different measures of airspeed: indicated
airspeed, calibrated airspeed, equivalent airspeed and true airspeed.
Bearing.
The horizontal direction to or from any point, usually measured clockwise from true north, magnetic
north, or some other reference point, through 360 degrees.
Deviation
The angle through which the compass needle is deflected from magnetic north due to the influence of
magnetic fields in the airplane.
Drift
the angle between the heading being flown and the track made good over the ground.
Equator
The equator is a great circle on the surface of the earth lying equidistant from the poles.
Great Circle
A great circle is a circle on the surface of a sphere whose plane passes through the center of the
sphere and which cuts the sphere in two equal parts.
Ground speed
the speed of the airplane relative to the ground.
Heading
The heading of an airplane is the angle between the longitudinal axis of the airplane at any moment and
a meridian.
Indicated airspeed
the airplane’s speed as indicated by the airspeed indicator
Isogonals or isogonic lines
join places of equal variation
Longitude
measured from the Prime Meridian (which is the longitude that runs through Greenwich, England),
measured in degrees east and west up to 180 degrees
Latitude
measured from the equator, measured in degrees North and South up to 90 degrees at the poles.
Meridians of longitude
semi great circles joining the true or geographic poles of the earth.
Parallels of latitude
circles on the earth’s surface whose planes lie parallel to the equator.
