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: 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!
DUAL XGPS251 Portable GPS and Battery Cradle for iPod touch
Robert E. Antonitis Jr. "Anto", Amazon
19 March 2013
Summary: The DUAL XGPS251 Portable GPS and Battery Cradle is a great add on for my 4th generation Apple iPod touch. I downloaded the MapMyRide free App to keep track of my bicycle rides. It can be mounted on the handlebars, although as of this writing I have not done so yet. I just carry my iPod in the cradle in my pocket. When you stop along a ride you can hit pause on the screen and then resume when you continue.
Summary: I thought this would give me the ability to get directions with my iPod Touch but all it does is give me my exact position. The GPS receiver is not that good either. I got into a little bit of woods and I lost my signal. so no good for hiking. In order to get directions you have to be near a wifi source. Then it only shows where you are on the route and doesn't give you turn by turn instructions.