Summary: I bought this for a trip I was going to take in order to make my Ipod GPS capable, it worked wonderfully at first. Halfway through my three week trip it started losing signal easily. It was only about two months old. After I got back from my trip I used it a few more times than it just stopped working. Then the I pod didn't even recognize it anymore so I tried a different Ipod same thing. Funny how this happens right after the warranty is up.
Summary: Terrible, awful, despicable product. I bought it years ago and it was junk then. I cannot imagine anyone is thinking of buying it now, since most phones now come with GPS, and this product has been discontinued by the manufacturer. If however, you somehow stumbled upon this product, just ignore it and move on. I wanted it to work so badly.. I downloaded so many GPS apps both free and paid, hoping something would work and make my purchase worthwhile.
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!