I have the TomTom apps on my Iphone. I have used them regularly in New Zealand, USA, Canada and Australia and have found them to be excellent. Good instructions and plenty of warning for upcoming turns (especially useful if you have been dumb enough to get yourself out in the fast lane on an L.A. freeeway in rushhour.....). I haven't tried it out on the bike yet but my engineer and his wife have used theirs both here and the USA (inside a waterproof mounting off ebay) and swear by them.
"Twilight's like soccer. They run around for two hours, nobody scores, and a billion fans insist you just don't understand"
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