Google Maps Mobile Data Usage

Google Maps is a huge data hog if you use it for navigation a lot.  Using Google Maps for navigation can easily send you over your 2GB data plan per month in a hurry.  Why is the data not cached?  Why don't they prompt you to use the driving option which allows you to download a cached version?    What is causing so much data usage?  Is it the traffic data?  If you have gone over your 2GB monthly data usage on some carriers like T-Mobile your data will just stop.  Good luck getting directions if you are driving around and suddenly your data just stops.  Do the carriers give you any notification that you have run out of data?  No they just stop giving you service.   More notification is obviously needed.  

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