I thought after purchasing my tomtom app that I would be able to use it right away. After doing research online, it seems like the 2G models aren't capable of full GPS. It looks like I'll have to purchase a GPS accessory hardware add-on that'll plug in at the bottom to act as an antenna.

My question is what is the best GPS accessory to buy. I came across this article today:

iGPS360 adds GPS to iPhone 2g and iPod Touch | iPhone Buzz

Any feedback is appreciated. Thanks!