对于城市车辆GPS导航来说，其很大的一个缺点是跟踪卫星的信号常常由于建筑物、隧道及树木等的遮挡而使GPS的定位精度大大降低，甚至无法进行正常的导航和定位。

GPS can not be used continuously for city vehicle navigation due to the loss of satellite signals by obstructions from buildings, tunnels and trees etc and it leads to low positioning accuracy.

youdao

对于城市车辆GPS导航来说，其很大的一个缺点是跟踪卫星的信号常常由于建筑物、隧道及树木等的遮挡而使GPS的定位精度大大降低，甚至无法进行正常的导航和定位。

GPS can not be used continuously for city vehicle navigation due to the loss of satellite signals by obstructions from buildings, tunnels and trees etc and it leads to low positioning accuracy.

youdao