Assuming GP is talking RTK GNSS[0] it can be down to cm accurate with good techniques. GNSS can technically get down to mm accuracy but that typically requires

Assuming GP is talking RTK GNSS[0] it can be down to cm accurate with good techniques. GNSS can technically get down to mm accuracy but that typically requires static sites with lots of data. [0] https://en.m.wikipedia.org/wiki/Real-time_kinematic_positioning https://en.m.wikipedia.org/wiki/Real-time_kinematic_position...