Originally Posted by lhendrik
+1, I use iphone 4 with navigon as my backup nav device. works great. Never an issue. Used it from France to Andorra last summer.
With the iPhone I generally use the build in Maps app - works great here in the area. I also have the TomTom app for Europe and the Navigon for the US. Never had any issues with the software or stability.
Only issue is when the phone gets hot in direct sunlight - it might not like that, not charge or even shut down.
But still - on the bike I mostly use my Garmin GPSMap 60CSx. Works great.