I have obtain 2 shield from Itead; GPS Shield & IComSat GSM Shield. I have a requirement to develop an Arduino Uno prototype and used a serial interface to communicate with this two shield. My sketches using SoftwareSerial but it seem not working properly, is there any optimal way to combine these two shield?
Arduino GPS Shield http://imall.iteadstudio.com/im120417017.html
IComSat GSM/GPRS Shield http://imall.iteadstudio.com/im120417009.html