> In exploring my new iPhone 5 I found a mapping app that will verbally and visually give direction like in my car.
>
> When I run that app am I using up data minutes?
I presume this is Apple's own Maps app.
First, using its direction-giving function means that you will be "hitting" on the GPS radio more or less continuously while driving. *This* aspect does not use data, but it does tend to run down the battery, so you will want to have a car-charging cord to keep it plugged in.
Second, there are now 4 levels of data usage for mapping applications:
1. Applications that have all their mapping and P.O.I. data built-in, and download NO data (except for traffic info, if you so choose). Example: the TomTom app.
2. Applications that have NO built-in maps but will let you download map data for your trip ahead of time, over Wifi, and cache it for later use. These also can get through your whole trip with NO data download. Example: MotionX GPS Drive.
3. Applications that need to download ALL their mapping data, but use scalable vector graphic data. Example: Apple's Maps.
4. Applications that need to download ALL their mapping data, but use bit-mapped mapping data. Example: Google Maps.
The difference between #3 and #4 is about a factor of five in the amount of data the app needs to download (bit-mapped has to download much more data than does vector).
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Jim Saklad mailto:jimdoc@icloud.com
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