Electronics errors are one of several accuracy-degrading effects.  They include ionospheric effects, ephemeris errors, satellite clock errors, multipath distortion, tropospheric effects, and numerical errors.
Inconsistencies of atmospheric conditions affect the speed of the GPS signals as they pass through the Earth’s atmosphere and ionosphere.  Correcting these errors is a significant challenge to improving GPS position accuracy.
These [...]

When people talk about “a GPS,” they usually mean a GPS receiver. The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails). As we said in the section above, the U.S. military developed and implemented this satellite network as a military navigation [...]

GPS design is based partly on ground-based radio navigation systems developed in the early 1940’s that were used in World War II.  These systems were named LORAN and Decca Navigator and were focused on knowing where the enemy was so they could either attack or retreat depending on the size of the forces.
Additional inspiration for [...]