II Morrow Inc. 920 GPS - Manual (Page 90)

DTK (Desired Track): The desired course of
navigation between a point of origin and a destination
waypoint.
Elevation: The altitude above ground.
Fix: A geographical location determined by either visual
reference or by electronic navigation aids.
GPS (Global Positioning System): Also known as
NAVSTAR. A constellation of satellites launched by the
U.S. Department of Defense into six orbit lanes (four
satellites per plane) at an altitude of 10,898nm above the
earth. The GPS constellation currently consists of 25
orbiting satellites.
GPD Overlay Approach: A non-precision approach
(such as a VOR or NDB approach) that has been
approved for use with an IFR approved GPS.
GRND (Ground): Ground communication frequency
GS (Ground Speed): Speed of travel across the ground.
In aviation, the relation between ground speed and air
speed is affected by the prevailing winds.
Icon: A symbol shown on the display depicting present
position. The icon may be an airplane, boat, land
G
3