Why? I always see such massive push back to technology in what would theoretically be a tech-adopting crowd.
Why would i, as a band playing Son, want to have to stop practicing or playing a set to call my family back in a timely manner? Couldn't some technology, perhaps a device in my pocket, allow my parents to know where i am, handle the burden?
Why is my mother knowing where i am such an invasion of privacy? Mind you, i'm 30 now, but i don't care if my wife knows where i am 24/7. Hell, i want her to. I'd also like to know where she is. We've got nothing to hide from eachother, so why should the 1950s method of calling eachother periodically to ping our locations be used? Why is 1950s your metric for success here?
I want technology to make my life less of a hassle. By all means, make it secure, i'm not arguing anything different. But i'd like to move beyond 1950 please.
"Giving him a call" is all fine, except if they are mid set or are tearing down while another band plays - stages can be loud places, and not the best things for talking on a phone, or even texting when they are busy moving gear. A quick check to see "Oh, he is still at the venue" or "He appears to be at the band's storage lockup right now" is enough for me to know that it is pretty much ops normal.
The disconnect here for me is that your hypothetical is hardly a new phenomena unique to our time. What would you have done in the 50s? 80s? 90s?
Let's put things in perspective here. The very fact that you can have real time updates on the metrics off the /device/ that is expected to be carried with your son means you have a direct channel of communication to your son's device. Worried? Give him a call. Problem solved.