There is a scale and pervasiveness of monitoring at which a lack of expectation of privacy becomes a certainty of the absence of privacy and I don't think that

There is a scale and pervasiveness of monitoring at which a lack of expectation of privacy becomes a certainty of the absence of privacy and I don't think that should be the expectation. Regardless, there are, as you say, locations where the expectation of privacy does have legal force but GPS monitoring doesn't care.