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.
That sounds far more (and acceptably so in my view) stochastic tho, like, do they have on-demand "lets see where lol is right now even though I have zero need to know currently" or is it just like u verbally check-in when they Signal u?
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.
If you actually need to, u can "share" as like a thing to attach your actual GPS location in Signal, no different from sharing a pic or file or dictation