GPS/GPRS on battery

Hi,

I'm very new to the world of Arduino, so forgive my lack of knowledge. I've looked in some places for initiation but the information out there is rather overwhelming.

So my project is simply a gps shield and a gprs shield strapped to an arduino running on battery. The gprs shield should always listen for requests over the network and the gps should only be activated when a request comes in. The entire thing will run on batteries. (They can be changed every so often). So my questions are: 1) Are there shields on the market whose current input are low enough for the project to be viable 2) What kind of Arduino board would you recommend for such a project

Quantaliinxuite: 1) Are there shields on the market whose current input are low enough for the project to be viable

Depends on what you consider to be 'viable'. The three, four popular GPRS devices all draw up to 2 amps when handshaking with the cellular network.

Are you planning on using large batteries?

You can get combined GPS/GPRS devices, look for SIM908 / SIM808.