Weather Radar Over GPS-NOT Cellular Signal

[flyhigh]

I'm looking for an app which would let me view live weather radar on my phone (touch pro) without using the cell radio. I'd like to be able to use my phone in an airplane or boat where there is no cell signal and still get live radar. I'm not sure if this is possible but it does seem plausible. It is possible to use the phones GPS without having cell coverage so why not receive radar? I wouldn't mind even using some kind of USB adapter (or Bluetooth) to connect to a seperate receiver if needed to get this info from either GPS or even an XM/Sirius signal. Can anyone point me in the right direction for a way to view live weather radar on my phone in an area where there is no cell signal?