Can I use Navigon without cellular data connection???

[bibicall]

I am from Taiwan. I'll visit San Francisco in January and I will drive from Las Vegas to Grand Canyon National Park.
I'll download Navigon app on my unlock iPhone 4 and buy the AT$T goPhone pay as you go sim card.
Should I buy the data plan too for Navigon navigation??
Someone told me that I can turn on the 3G connection for GPS and turn off the cellular data connection.
Is that OK???

 

[maflynn]

Navigon uses stored maps unlike some other iPhone GPS apps. That being the case you do not need a 3G connection to use this app, so you can do without the data plan for your iPhone.

 

[takeshi74]

Navigon uses stored maps unlike some other iPhone GPS apps. That being the case you do not need a 3G connection to use this app, so you can do without the data plan for your iPhone.

^ This. Unless you want to use features that require data (traffic, weather, etc).

 

[ThomasN1981]

Your iPhone will not enable 3G if you don't have mobile data settings defined.
At least this was the case when I activated my SIM.

You don't need any data connection to get a GPS Signal.

 

[bibicall]

Thank you all. I will try it when I arrive SFO.
I can't wait to visit SFO. HAHAHAHA!