Pilot use a hand - hold gps unit to measure their speed over the ground and to report their landing position following xc flights 飞伞者可以使用手持式gps去测量飞行时对地速度及提供越野飞行时降落位置座标。
2.
Carrying on the survey fight in some area of chaoshui basin based on the survey system in high accuracy aeromagnetic gradient 摘要在引进高精度航磁梯度测量系统的基础上，对潮水盆地某地区进行航磁梯度测量飞行。
