1. You don't get voice directions. Frankly, who wants to look at their navigation screen constantly. Use a real (dedicated) GPS device and see how it is supposed to work.
2. You lose your maps when you have no phone reception. Getting navigation directions on your phone screen (with no voice prompts) is cool for about 2 minutes, or until you are actually using it go get somewhere, and then you lose your phone reception (for any number of reasons), and oh look I have no map data displayed any more, great...
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Oh please! No you can't!
1. You don't get voice directions.
Frankly, who wants to look at their navigation screen constantly. Use a real (dedicated) GPS device and see how it is supposed to work.
2. You lose your maps when you have no phone reception.
Getting navigation directions on your phone screen (with no voice prompts) is cool for about 2 minutes, or until you are actually using it go get somewhere, and then you lose your phone reception (for any number of reasons), and oh look I have no map data displayed any more, great...