I’m 18 and fine with my parents knowing where I am so we can coordinate mealtimes and stuff. I really don’t care for having a third party spy on me 24/7 though. We just Signal each other “I’m at xyz location, be back soon” and that’s plenty enough.
We just verbally check in and I’m totally fine with saying where I am. I believe the important thing here is trust. If, hypothetically, we were able to set up something privacy-respecting that communicated my GPS location to my parents 24/7, I wouldn’t be a fan of it. It’d feel like my parents are monitoring me because they don’t trust me to be truthful about my whereabouts.