Support Navigation data usage rate on S2 ?

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http://androidforums.com – Hi Coming from an unlimited data plan down to a rather tight 100MB per month, I need to be careful about data usage. I'm planning to use the Navigation app tomorrow for a 25 mile drive. What is the approx. data usage rate for Navigation satnav on the S2 ? Can I minimise it e.g just map rather than satellite images etc. ? I also gather you can download & cache the maps via wi-fi to reduce data usage - how does one do this ? thanks (General)