Seems smart; installing now for me & Margot:

Loved ones can request your location––even if your phone is offline or you can’t get to it. You can also proactively share your location in everyday or emergency situations.

In preparation for a situation where you might need help but can’t answer your phone—imagine you get lost while hiking and lose service—you can choose how long to wait before your location is automatically shared with a trusted contact who asks for your location.

Available now on iOS & Android alike. [Via]