Pioneer's iPhone cradle has an external antenna that works with all GPS-enabled apps for stronger reception and location accuracy. The SmartCradle features an integrated amplified speaker with volume control for hands-free calling, a mini-USB input and audio/video output, and it charges the connected iPhone. A built-in gyro sensor and accelerometer help keep track of your driving efficiency and habits with a built-in light that turns from red to green as you drive. $120.