... to do stop & go work.,after collecting data with built-in program,you can postprocess it in the office and get ... SBAS corrections, or use GPRS module to get a network differential correction from CORS.High ExpansibilityGenerally, ... need an external GPS antenna, which can get high-accuracy result,S750 can switch between ... portability, whose industrial design be able to withstand the test of tough environment.Handheld ...