Has anyone taken a Google Nexus 7 on tour? I'm planning an off-road tour in Colorado this summer, and it seems that the Nexus 7 has a GPS antenna, is less expensive than a Garmin hiking GPS, has a bigger screen, and is also an e-reader and can connect to the internet with wifi. My only concern is durability; everything I've ever taken on a tour has gotten at least a little bit wet, and bouncing around inside a pannier seems like it could be hard on electronics. If you have any experience with the nexus 7, please let me know how it held up. Thanks.