here is my 2 cents.
i rode Africa with a motorola defy. this sucker is water proof, dust proof and shock proof. i used 2 maps/nav apps sygic and navit (both fell off the back of the internet truck) i could download the whole of africa on navit and some countries with sygic.
i would put my phone in the map section of my tank bag.
i could also use the phone for all my music and both gps apps would interrupt my music to tell me voice directions 
the navit maps weren't the most comprehensive but not much of africa is mapped!
i could also check my email and do all the net stuff with this phone and it was way cheaper then a good gps it only cost me around 300 bucks. fits my phone gps and some computer needs. i love it and use it all the time now for navigation both online and offline.

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