Summary: The only thing this was good for was the case. The GPS was glacial, and I had to remove the case whenever I wanted to charge the touch as it lengthened the distance for the jack and wouldn't charge that way. A total wast of money.
Summary: The usefulness of this dock is limited to the quality of the apps you run with it. That said, satellite acquisition is slow. The internal battery is nice but only runs the GPS receiver in GPS mode. The unit would be fine in a car but not great for walking or anything active.
Summary: How to Fix XGPS251 or XGPS150 Failure to Locate with the GPS: 1. In iPod Settings/Privacy, turn Location Services to OFF 2. Restart iPod touch*: - Hold down the On/Off button until the red slider appears. - Slide your finger across the slider to turn off iPod touch. - To turn iPod touch back on, hold down the On/Off button until the Apple logo appears. 3. In iPod Settings/Privacy, turn Location Services to ON 4.
Summary: DUAL XGPS251 initially worked with my iPod Touch 4th Gen. A couple of months ago it stopped providing GPS location. We spoke with Dual tech support and they were unable to restore the GPS function. So today I received a replacement under warranty (cost us $17 in return shipping.) The replacement unit did not work, so again I called DUAL tech support. This time, they told me that apparently the XGPS251 does not work with the current iOS 6.1.3!
Summary: This would be great if it worked. I was able to get it to work a couple of times and tried several apps and it was slow to get a signal when it did. I worked with it for a week and spent money on apps and just could not get it to work, even called DUAL and no help.