I recently used my Samsung Galaxy S3 with the TomTom app for a trip to the South of France and back, it worked perfectly. You will need a power source and decent case though. I got a waterproof case off ebay and run a power lead in from the usb socket on the bike.
Screen operation through the case is a bit hit and miss with gloves on, but otherwise it's the best satnav I've ever used. I run a 32gb sd card and have all of Europe and Africa on it, they take up about 7gb. Maps for the whole of the world are free to download, and then mean you don't need a network connection like you would for say Google maps.
I've actually just got a new phone and I'm keeping the S3 to run as a stand alone satnav, as I can also use it for music through my bluetooth intercom as well. Second hand they are something like £60, and reset to factory settings it's superfast again!
It also means I have a spare phone if needed, as all I do is swap the sim card into it.
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