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https://ja.hideki.hclippr.com/2007/11/28/google-maps-for-mobile%e3%81%a7gps%e3%81%aa%e3%81%97%e3%81%a7%e5%a4%a7%e3%81%be%e3%81%8b%e3%81%aa%e7%8f%be%e5%9c%a8%e4%bd%8d%e7%bd%ae%e3%82%92%e8%a1%a8%e7%a4%ba%e5%8f%af%e8%83%bd%e3%81%ab/
Google Maps for MobileでGPSなしで大まかな現在位置を表示可能に