Gps tracker factors
US Department of Defense SA satellite signal interference. (Satellite signals are controlled by the United States and occasionally may disrupt signal services.) 2. Weather factors. Such as: sunspots, bad weather (reduce signal strength, but does not affect the positioning) 3, electrical electromagnetic interference; under shelter (buildings, valleys, canyons, tunnels) 4, the windshield on the car window insulation film Hot paper, metal component shielding and so on. (reduce signal strength, but does not affect positioning) Time display is not normal The date and time on the GPS is used to display the satellite time. GPS receives the satellite signal to display normal, when the signal is not normal, it is not a common electronic watch. Can not be adjusted cannot be saved. GPS positioning principle A total of 24 satellites in the satellite positioning system are distributed on six tracks of work, and each track forms a 120-degree angle with each other, enabling GPS users to receive satellite signals at any time and place to locate them. And it is not affected by the weather. It is affected by the terrain or shadowing of buildings, that is, it is difficult to receive satellite signals indoors or on buses.