What are some alternatives?
OwnTracks - Cross-platform location sharing
Find My Friends - Use Find My Friends to keep track of your traveling companions when you’re on vacation.
Life360 Family Locator - Life360 helps manage the chaos of your daily family life and lets you know:
Trusted Contacts - Let your loved ones locate you with Trusted Contacts by Google.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Osmo - GPS-monitoring : easily record a GPS-track travel and be able to watch an entire group of people.