Macworld has interviewed Tom Murray, Vice President of Market Development for TomTom, and found out ’some’ information about the TomTom solution for the iPhone. It seems that it will be a one-off purchase (no subscriptions), and that is about all we know at the moment except that late Summer is still the expected release date.

“While other vendors have announced, and in some cases already released, navigation apps for the iPhone (AT&T’s Navigator and Sygic’s Mobile Maps are a couple of the latter), Murray noted that TomTom for iPhone is unique because it’s a two-part solution. By combining software and hardware, the company says it can provide an experience that’s much more comparable to that of a standalone navigation unit than an app on its own.

According to Murray, the biggest challenge presented by an iPhone-based navigation solution is that dedicated navigation devices have better GPS reception than an unassisted iPhone. In addition, the iPhone doesn’t include any of the special technologies TomTom implements in its own navigation units; for example, gyroscopes and other hardware that allow a unit to better approximate its position when it loses the GPS signal in, say, a tunnel. The size of the iPhone is also an issue—4.3-inch screens are becoming the standard for standalone devices, while the iPhone’s screen is only 3.5 inches in size. And few iPhone owners have car mounts for positioning the phone safely while driving.”