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Amazon.co.jp: Somewhere GPS 2: 6 months free per month, SoftBank also works with docomo au MVNO smartphones, IP67, waterproof, high precision, watch children and elderly people with a smartphone, compatible with 2
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GPS will be accurate within one foot in some phones next year - The Verge
We Tested Mobile GPS/GNSS Accuracy and Found Some Surprising Results | by !important Safety Technologies | Medium
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