Engineering GPS instrument, which good?
If it is a civil engineering survey, I think Guangzhou is more suitable.
Imported Leica, Tianbao and so on are very good, dual frequency double star, stable performance, but the price is too expensive, it is recommended to do GPS static measurement of the purchase, high accuracy. Domestic GPS, such as Suzhou, south red light GPS, Ling Rui series also, but the performance is not stable, used in conventional RTK, CORS mapping is OK, the accuracy is not high, but the price is not expensive!
I am doing geological survey, the Guangzhou instrument manufacturers, calibration and good resistance to fall, I do almost all engineering project in the field, had previously been imported, but the boss felt too expensive, so this year is used in China, with long, found it very high the domestic price of imported expensive.