The US's GPS satellites circle the earth once every 12 hours. As long as you are not indoors or underground, and there are no obstructing objects, you can receive satellite signals at any time and from any place, regardless of weather conditions.
美國的 GPS 衛星每 12 小時繞行地球一週，在地球上的任何時間、角落，不受天候影響，只要不是在室內或地下室，沒有被遮蔽物掩蓋，都可以接收到衛星訊號。