Navigation using satellites, satellite-based navigation.

Satellites send signals from a height of ca. 20,000 km. The GPS receivers convert these signals into positional data.
Modern GPS instruments are highly accurate. However, problems with reception can occur when they are used in forest areas.
A GPS instrument is the obvious choice when monuments below ground have to be surveyed in areas without a sufficient survey grid.

Fig.: A GPS instrument in action
GPS instrument in action

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