Over at Macworld, TidBITS editor Glenn Fleishman explains Apple’s curious statement that GPS positioning would take minutes without its secret sauce of Wi-Fi network and cell-tower location data. Apple (and other mobile device makers) supplement GPS with several clever techniques to get a faster fix. follow link
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Sometimes you want to move a file in the Finder across volumes, not copy that file. Holding down the Command key while dragging ensures that the item is copied, and then its original deleted, adding up to a move.
How the iPhone Supplements GPS