I'd like to find out how much data I would likely use while following driving directions on Google Maps. I don't want to use up all my available data with just Google Maps, and I am also hoping not to have to navigate from printed driving directions.
As long as you're not using satellite view, not much. I can't give you an exact amount, due to the huge variance in map complexity, but if you're using an Android phone, there's a sub menu under settings that will show how much each app has used in a set time frame.
When I setup the directions, I keep the Google Maps application in route view so that I see the directions.
Right now, I'm at 315MB of data used. I'll be taking a trip next week and want to be sure that I won't use in excess of 1GB of data before the cycle ends.