I have worked out the ultimate GPS tracking solution for the Phantom 3. More details to follow and a complete setup guide. But here's a preview: 1. Costs around $3 a month for cell service, but never more than this (lifetime). 2 flights literally uses 1 cent of data total. 2. Weighs just 20 grams. 3. No battery to go dead. 4. Android (app), iOS (app), and web-based realtime tracking. 5. Easy mount to Phantom 3 (outside, but inside possible, too). 6. GPS itself only costs only $35. 7. Looks good and clean when setup and mounted (better than anything I've seen yet including expensive drone trackers with more pricey service plans). 8. Very slim form factor. 9. Tested in flight and works great. 10. No RC, video, or compass interference. 11. Fun project. Watch me in the next few days for a long post. More details to come!