You need to consider your location known to the government at all times if they know they'd want it beforehand. Most places are either surveilled heavily or sparsely populated, i.e. good for satellite-based observation. Maybe also to big enough corporations if they really want.

This does not imply that it is easy to track everyone everywhere at all times. I guess most targeted ones would like to protect their communication, and even meetings in person are possible if you keep some safeguards.