1. GPS signal accuracy is controlled directly by the U.S. Department of Defense. The 1.575GHz channel has been supplied for civilian use. Incoming signals from natural or artificial sources can affect GPS signals.
2. Weather factors (sunspots and bad weather may reduce signal intensity, but generally do not affect positioning).
3, electromagnetic interference (a few users have happened). Radios and strong magnetic fields all produce different levels of interference.
4. Under the shelter (in the building, vehicles, insulation paper, trees, metal components shielded) will cause the GPS signal to reduce, try to place the antenna in a position that can directly receive the sky GPS signal (such as the position of the front window) .
5, GPS signal in the open mine only have the best reception. High-rise buildings and dense high-rise buildings will have an impact on GPS signals. Relatively speaking, GPS signals will be better in open areas.