Earlier quoted context omitted.
I actually read through that entire document out of curiosity. As far as I can tell it only applies to audio recording (and telegraphs, and cable TV, and a couple other misc items, but not video from what I see). Also, there's the bit right at the top: > Therefore, it is not the intent of the Legislature to place greater restraints on the use of listening devices and techniques by law enforcement agencies than existe…
> So is it a misdemeanor to track your child via their cellphone in CA? It's worth looking at the whole section: CA Penal Code § 637.7 (2017) (a) No person or entity in this state shall use an electronic tracking device to determine the location or movement of a person. (b) This section shall not apply when the registered owner, lessor, or lessee of a vehicle has consented to the use of the electronic tracking device…
I too was initially confused by the "or other movable thing" part, but I'm pretty sure the the cell phone itself qualifies as a movable thing in this context.