I've tried Garmin Western Europe AND Garmin USA and both programs don't run in my jailbroken 3GS 5.1 iPhone. I've tried Garmin-USA_OnBoard_NoMap.ipa which lies in the first post and had the same result. I download many versions of the above programs but when I run the program I get the Garmin logo for about 30 sec and then the application closes. The only Garmin application that opens was the older Garmin StreetPilot (the green one) with the ondemand maps.
Can anyone help me?