In reply to Phantom Disliker:
It can be set to permanently on too.
Use inbuilt functions whenever you can is my advice. Lower battery usage generally too.
My wahoo also shares location, but is not as reliable as the Google one if it loses signal.
All require some kind of signal to share. Also worth considering they get a plb which needs user activation, but so can the emergency services if they do get stuck in an urgent situation
Post edited at 11:17