Thanks for the link - question, the link says its handlebar screw mounted and you state fuel tank. Do you have a pic ?I bought a SW-Motec mount which bolts to the front of the fuel tank. Well made, strong and vibration free. See SW-Motec GPS Mount
I used a cheap Andriod based Chinese GPS I bought off Alibaba, so effectively it comes with no warranty.
You can download Android apps from the Google Playstore and I'm happy with it, but it is not in the same class as a TomTom or Garmin.