HangOut is a simple Android app to follow your family and friends on the map and know where they hang out. You can share a link, so others can follow your trip real-time on Google Maps. HangOut can automatically send a text message when you have arrived safely at you destination. If you enable the GPS, colored dots from blue (0 km/h) through red (50 km/h) will indicate the velocity on your trip.
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Terrible Just try to send a group message when a few people do and don't have the ap. I've used it for close to to two years, and regret it.