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GPS, or the Global Positioning System, is a global navigation satellite system that uses at least 24 satellites, a receiver and algorithms to provide location, velocity and time synchronization for air, sea and land travel. The satellite system consists of six earth-centered orbital planes, each with four satellites. GPS works at all times and in almost all weather conditions. This post answers “What is GPS?” and explains how it works.

In general, there are five key uses of GPS:

Location — Determining a position.
Navigation — Getting from one location to another.
Tracking — Monitoring object or personal movement.
Mapping — Creating maps of the world
Timing — Making it possible to take precise time measurements.

منبع : geotab
Mobile GIS Systems
Single Frequency
RTK base stations