Follow along with the video below to see how to install our site as a web app on your home screen.
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It should also be noted that google's navigation will also do limited driving directions in the event of lost data connection although the rerouting is rather minor...meaning the more you go off course the less chance navigation will be able to reroute until a data connection is re-established.
Google Maps Navigation for mobile
Why it's not working for the OP seems odd though, you may need to update google maps although the change for Navigation came out last summer.
Interesting enough I have been using my tablet to navigate in my car. Recently I found that Google has implemented PreCache Maps for users without 3g/4g wifi. So I decided to try this on my Vtab 1008, I precached some addresses, then turned my wifi off and then tried to navigate the location. I was without lock, it just spins saying trying to get directions. The VTAB has build in GPS and I cached the maps and it shows 9 locations cached. Googles press release mentioned this for Googlemaps and Navigation. Hopefully they fix it soon.
Has anyone had any experience with this?