Kensington today provided users of any iPhone GPS app an option to improve the GPS navigation experience with a new peripheral. The Sound Amplified Cradle mounts to the windshield or a vent and passively doubles the volume of the built-in speaker to make spoken driving directions more audible. It's characterized as an ideal fit for NAVIGON's updated app but should also work for any iPhone mapping app that speaks its directions as well as in speakerphone calls.
