But livemap isn't guaranteed to show everyone.
I'm pretty sure this is in the general release version for iPhone (I'm on the beta program, and get lost sometimes if I'm on a beta version or release version).
But when in navigation, open the menu, swipe the menu right to left to bring up the second menu (Don't worry, the app only tells you about this once, and everyone I've talked to has forgotten about it, or doesn't remember seeing the pop up.) Choose "Share dest". Then choose text or email. Note that I do recall issues with the ETA in these to be incorrect, so you might pay attention when you do this to see if it is correct.
This is not automatic, but it's a start.