Errors of GPS

the electromagnetic field that the receiver’s internal electronics generate when it’s turned on.

GPS errors are largely due to water vapor in this layer of the atmosphere. It is fairly insignificant to GPS.

Caused by slight discrepancies in each satellite’s four atomic clocks.

Variation in satellite orbits due to gravitational pull and solar pressure fluctuations.

Causes the GPS satellite radio signals to be refracted as they pass through the earth’s atmosphere

caused by reflected radio signals from surfaces near the GPS receiver