So impressed with this little gadget. We needed something to calculate the miles we were traveling on horseback. Looked on the Endurance equipment site and they recommended one of these. I went for the rechargeable version because it would work out cheaper in the long run. The only down side is as described on other forums, it takes a while to pick up its first satelite link. And like most people I didn't read the instructions, should have said yes to having moved hundreds of miles instead of no. It then picked up a signal within about 25 minutes.