Hello. I would like to share my experience using the Navigon application on my iPad (a Wi-Fi model without cellular function). I also purchased the sky pro GPS device to receive GPS information and it works well with the Navigon application. The maps are easy to use and the directions are fairly good. In that way, I am satisfied with the Navigon application as it allows me to use it without a data plan. My main problem is with the Traffic Live service: it wont work without a data plan and there is no indication of that before purchase, either on the Apple store or on Navigon website. This may be obvious to many but for people who are not tech savvy like myself, it should be clearly indicated by the vendor...
Franciscophilus about NAVIGON North America, v2.9.1