Originally Posted by
JohnJ80
If you have an iPhone, the Find My Friends app does that and it has virtually no hit on the battery. It's free on the app store.. Your position isn't sent until they ask for it. We've used it for years and it works great. You just have to grant permission to specific people to see your location. That's it.
J.
This ^^^^^^
They can also set alerts to when you leave or arrive at a location. FindMyFriends is an Apple app, it may already be on your phone and you just don't know it.