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.
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.