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There are several reasons to use your iPhone (or Android) as a direction-finder instead of using your dedicated GPS. The phone can provide access to your address book for the map app, and it can respond to voice commands! Siri will access all your searching apps when you push the Home Button. You just tell her what you want. Mounted on your visor, the phone is also handy as a hands-free speaker phone with Siri doing the dialing for you. Assemble with two 1/8 inch dowels and 4 zip-ties (not included).