Tom Tom Go 300 adapter for bike

Has anyone come up with a clever way to 'adapt' the Tom Tom Go 300 for use on a bike?

I am thinking of putting it in a suitably sized tupperware box, lined with foam and with magnets on the bottom to attach it to the tank.

Matt

I use a garmin i3 with a freezer bag (like a thick sandwich bag) over the top, with a hairband to hold it on - works great in the rain, etc.

I made up a mount to fix it to the bars, though the magnets sound good (as long as they don't affect the electronics, etc. inside) does it have a hard drive inside? they're meant to be problematic on bikes due to the vibrations, and magnets and hard drives don't get on well.

No hdd inside the Go 300. I would have thought the foam padding inside the box would have taken care of the vibration.

Matt