Ah right, sorry. As others have said, traffic needs to be updated regularly, I've not noticed GPRS charges being significant, although I'm always wary of such things as it's possible that it could go into a loop and cane your GPRS connection, running up a large bill which you'd then be obliged to pay. I bought the TMC radio traffic receiver for this reason, sadly it was useless and got sent back for a refund.