Can I use GPS while the data and cellular networks are turned off?

Here's the deal: I am traveling on the Alaska Highway from Alaska, through Canada, to the lower 48 states. AT&T has advised me that while I am in Canada I will be charged 79 cents a minute for airtime and 2 cents per kilobyte for data. Ouch. Given this, I intend to turn my iPhone on "airplane mode" while in Canada, so I don't accidently fetch mail, or do some other thing which would load data at the cost of 2 cents per KB.
BUT! I would like to be able to take pictures with my iPhone 3G and have them tagged with location by the GPS. Everything I have read indicates that GPS is turned off when the phone is in Airplane Mode.
So, my question is: can I still retain access to GPS for my photos while turning off all other radios in my phone? With the new Places feature in iPhoto, I'd really hate to have 2,000 miles worth of photos and no location data to go with them, ya know?

Tamara, thank you. Of course I already did that, and no, they are not geotagged. Which is why I specifically phrased my question, "can I still retain access to GPS for my photos while turning off all other radios in my phone?"
In other words, is there SOME WAY--ANY WAY--to turn GPS back on, like you can with Wi-Fi? Or maybe there is some way, any way, to turn off all the cellular functions only, while leaving the GPS receiver on?
I am aware of the "Data Roaming" setting in the Network settings. I have always had that turned off, but I cannot experiment with that setting, as I am not in an area where roaming would occur.
I'm just hoping to avoid a surprise huge bill due to GPS grabbing some data or relying somehow on the cellular network, and am hoping to know if anyone has any experience with these issues. At 2 cents per KB, an average email would cost $1 to download. I have no idea what kind of data flies back and forth when GPS is used, or if the ONLY data received by GPS is from the navsat system. I seem to recall that iPhone GPS also relied somewhat on cellular data, though for photo geotagging it probably shouldn't have to.
I apologize if I was not clear in my questions.
Thanks so much for your help!
Message was edited by: Ronald S

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