The basis of GPS is “triangulation” from satellites.
We’re using the word “triangulation” very loosely here because it’s a word most people can understand, but purists would not call what GPS does “triangulation” because no angles are involved. It’s really “trilateration.”
Trilateration is a method of determining the relative positions of objects using the geometry of triangles.
To “triangulate,” a GPS receiver measures distance using the travel time of radio signals.
To measure travel time, GPS needs very accurate timing which it achieves with some tricks.
Along with distance, you need to know exactly where the satellites are in space. High orbits and careful monitoring are the secret.
Finally you must correct for any delays the signal experiences as it travels through the atmosphere.
360⁰ Three-Plane Leveling and Alignment-Line Laser
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The Bosch GLL3-300 360° Three-Plane Leveling and Alignment-Line Laser features an all-in-one level and alignment solution. This leveling laser provides fast one-spot job setup. It allows users to line up level, align, square and plumb with one setup point by generating three 360° laser planes – one horizontal and two vertical. Featuring an upgraded diode with a brighter beam than previous generation lasers, the GLL3-300 has a visible range of up to 200 Ft. diameter.