I have CoPilot 8 for Android with maps of all of Europe and have been using it on the bike for almost two years now. Works pretty damn well, although it seems that the maps for France are a bit off (tells me to take the second exit in non-existent roundabouts or tells me to turn left when there's no street). I do have to tell you though that CoPilot loses its GPS signal quite often (I'd say between one and five times a day). The only thing that helps in that case is killing the CoPilot process using a task killer on Android. Don't know if that's an Android or CoPilot-related issue tho but consider yourself warned
"Life is not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece, but to skid across the line broadside, thoroughly used up, worn out, leaking oil, shouting GERONIMO!"