On 20th October 2024, it was our honor for the Surveying Instruments Division to be the guest lecturer on GNSS Surveying and Engineering at the Faculty of Engineering, Ramkhamhang University. Both theoretical and practical sessions used our Trimble R4s, R8s, and R10 GNSS receivers for data collection, such as static surveying, topographic surveying using the RTK method, and generating contour lines of elevation around the university. We also tested GNSS accuracy by collecting the points around the building and calculating the area. The results compared with other instruments were the same, but when using the Trimble. It was more convenient and faster.