Somebody mention GPS use 4 satellates to do 3D. No idea.
Just google a little
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• 測高度溫度有的手表都帶 -歌唱家- ♂ (69 bytes) () 02/23/2011 postreply 14:01:45
• 測高度溫度有的手表都帶 -歌唱家- ♂ (69 bytes) () 02/23/2011 postreply 14:01:45
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