They use GPS orientator, digital camera and other necessary appliance to collect and register data of every reference site.
他们使用 GPS 定向器，数码相机和其它必要的设备来收集和注册每个参考站点的数据。
2
The choice of Base Station is based on on-site reconnaissance, using GPS orientator, digital camera and other necessary appliance to collect and register data of every reference site.