I just downloaded an app that allows me to access the iPhone 3G's GPS data without having to download maps (like latitude and longitude, elevation, speed, distance traveled, etc.). I would like to use this latitude/longitude feature while doing some backpacking in an international country (with hard copies of detailed maps with GPS plots). I would also like to avoid using ANY data (or voice for that matter) while overseas to avoid the hefty charges. However, GPS does not function in airplane mode. If I leave the phone to pick up the GPRS/EDGE network, it will data bleed and cost me money even if I don't access any features, right? I hear the "turning off data roaming" function doesn't even prevent that for whatever reason. Is it true that as long as one's phone is on but not in airplane mode, there will be data bleed to some extent that will cost me a pretty penny? Is there any way for me to do this without removing the SIM card?