[mstevens]

Forget doing this on a cellphone for a moment. Do you know of ANY device on which it is possible to receive any signal other than GPS data using the GPS antenna? If so, perhaps it's possible on a phone.

Personally, I strongly doubt there's any practicable means to alter the GPS antenna and radio to receive from other satellites. GPS data streams are just limited to... well, GPS data. Not weather radar or porn movies.

As far as airplanes go, IMO you're better off as a pilot not relying on a cell phone and its tiny screen for your weather radar (unless, I suppose, you're talking purely about backup). A Touch Pro is not avionics. If you're talking about using this in someone else's plane, keep in mind that the regs prohibiting cell phone usage are actually regs prohibiting radio receivers and transmitters being used in the passenger compartment- it's just that cell phones are the most common example of such a thing.

As far as boats go, I don't think you have any business relying on a device this small for weather radar when you're far enough offshore that there's no cellular signal if you're in charge of the vessel.

Of course, that's just me. Perhaps there is some actual use for live weather radar a few inches across in a plane or boat that's out of cellular range that I just haven't thought of.