The Bad Elf GPS works with all iPod touches, iPhones and iPads that have the 30 pin connector, so yes it will work with the iPod touch 4th generation. All you do is plug it in and it works. There is no configuration needed. You can download the Bad Elf utility app to change certain settings (metric or English measure for example) but it works right out of the box. Once it is plugged in and has achieved Satellite lock it will receive GPS data (Altitude, latitude, longitude, direction, speed and time) directly from the satellites overhead. It then feeds this information to Apple's Core Location Services. At that point, the GPS enabled app that is running will call for and receive that data and use it to do whatever the app you are running does.
There are no monthly fees to receiving GPS data with the Bad Elf GPS. You do not need a wi-fi or cellular signal for the Bad Elf GPS to work. However the GPS enabled app has to store its functions (for example geotagging a photo) or its maps offline and locally on the iOS device because you will not have access to the internet. This means Apple's map program, because it tiles from screen to screen using the internet will not work with the Bad Elf GPS unless you are connected to the internet. It will turn your iPod touch into a turn by turn GPS if you purchase a turn by turn voice app.
Nov 14, 2012