The Nexus 7 has the built-in GPS connectivity features, but the tablet doesn't support 3G network. Can I use the Nexus 7 as a GPS system for navigation without a data connection?
Yes, you can in a limited way. The GPS pairs up with Google Map's offline mode for offline reference and navigation. You need to open Google Maps app, go to your location first, set it to offline view and download it. It allows you to store up to 80MB per region. Notes that it doesn't support downloading the entire "world".