On 10^th-12^th November 2021, our Surveying Division was honored and trusted from Cho Thavee Construction co., ltd. to delivered Trimble R8sLT GNSS which will be used in Double track railway project. The project is about 355 kilometers across 6 provinces – Khon Kaen, Roi Et, Yasothon, Mukdahan and Nakhon Phanom”. We also provided the on-site training course at Khon Kaen province by our professional product specialist and tested the reliability, accuracy and ruggedness. Even in the bush or canopy, Trimble R8sLT GNSS was still able to track and gave the surveyor the fixed accuracy from Real-time kinematic.