<P> A satellite ground track may be thought of as a path along the Earth's surface which traces the movement of an imaginary line between the satellite and the center of the Earth . In other words, the ground track is the set of points at which the satellite will pass directly overhead, or cross the zenith, in the frame of reference of a ground observer . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (May 2015) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (May 2015) </Td> </Tr> <P> In air navigation, ground tracks typically approximate an arc of a great circle, this being the shortest distance between two points on the Earth's surface . In order to follow a specified ground track, a pilot must adjust their heading in order to compensate for the effect of wind . Aircraft routes are planned to avoid restricted airspace and dangerous areas, and to pass near navigation beacons . </P>

Explain the impact of the six parameters on the ground trace