T'was a thread here very recently on the merits of using a decent waterproof box for a non-waterproof sat nav on a bike. Did anybody eventually come up with a really decent one that can be mounted and use one of the latest wide screen Nuvi's? I'm looking for a bigger screen, (a 21" jobby on the bike would be handy but then I wouldn't be able to see over it :-) ) to sit on the trusty steed. I have a doubt though that any of these waterproof box solution will allow use of the touch screen whilst housed? Once again I'd appreciate the collective knowledge and experience of the group. TIA.