Worried mom uses tracking app to save daughter in need of help

Macy Smith was stranded at the bottom of a ravine after a car crash sent her car over the edge; her mom used a GPS tracking device to find her whereabouts.
2:14 | 06/16/19

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Transcript for Worried mom uses tracking app to save daughter in need of help
Welcome back to "Gma." A mother saved her daughter's life thanks to her intuition and the help of a little technology. The mom using a phone app which showed her daughter in need of help. ABC's Lana Zak joins us with details. Good morning, Lana. Reporter: Good morning, guys. This is such an important story for parents to hear. Macy Smith has a fractured neck and lots of nerve damage, but she's celebrating being alive and it's all because of an app that her parentsade her use. A 911 call to help daughter who missed curfew. My daughter is in a ditch, in a ravine. Reporter: She was able to track down her daughter using the find my friends app. When found, she was pinned under her car. I don't know how I survived. Reporter: 17-year-old Macy Smith said it all happened last week when her car hydroplane and flipped three times and landed 25 feet down a ravine. Trapped under the car for six I was so relieved and when they came down to my car and I just cried tear of joy. Reporter: Her mom turned to the popular app after Macy wasn't responding to calls. I can't explain watching the gps on my phone, my dot getting close to hers and then suddenly seeing the tire tracks and that's what I could see. Reporter: The app allows you to share your location with select individuals who can track you simply by opening the app. She encourage other teens to do the same. I know it's hard for teenagers to give up your privacy but you like, you know, sneaking out and being places that you don't want your parents to know about it is not worth being trapped under a car for seven hours. Reporter: In fact, 28 cars passed by Macy, but they couldn't see her down in that ravine. Experts say, just make sure that you know their privacy policy. Back to you, whit. Happy father's day. Thank you, and good advice for all parents out. Coming up on "Good morning

This transcript has been automatically generated and may not be 100% accurate.

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