*"However in an ideal world yes you would know where your 11 yo was at all times"
No you wouldn't. In an ideal world an 11 year old is spreading her wings and learning independence. Which means that her parents don't know exactly where she is every second.*
I don't completely agree. Knowing where my 11 year old is does not in any way conflict with her becoming independent. Interfering with that might, yes.
Suppose at 11 she is heading off to the library by herself. To get there, she has to cross several major roads, catch a bus, and walk through a park with a small stream (this is hypothetical, but that's basically the route I'd have taken to the library at that age myself).
If, along the way, she misses a bus, or slips and gets her shoes wet in a stream, or gets a bit lost - those are all opportunities, as you say, to practice her growing independence. Swooping in and sorting it out, as some parents are wont to do, can hold that back. Knowing where she is, can't.
So yes, I'd want to know where she was going and what route she was taking. In the real world, I'd expect her to deviate from that route, especially as she grows more confident, and I'd expect that sometimes this would result in problems - being late, losing a library book, whatever - for which she'd endure the natural or imposed consequences - grounded for being late, or having to pay for a library book.
When she learned to walk, I was right there, watching. I didn't grab her when she started to tip, I let her fall. But I didn't just leave her alone to get on with it, in the guise of giving her independence. The shape of that changes with her age, but not the principle.