im very confused by this product . I first charge it for 24 hr , per instruction . then plug it into my ipad . I do download the app that it suggest . but what can you do ? altitude , speed , the Compass be a little off , ... im just scratch my head try to think what can this do . so last week I have go on a road trip . while sit in the back seat , I plug the GPS into my ipad , and I say to myself , let I see if map work . sure , it work with map , but you have to make sure you have a map that be displayable because once you turn wifus off , you on you own . solution : if this gp work with a pre map program , then this would be 100 % worth it . im still scratch my head ... what to do with it ? its currently sit on my night stand . overall , not recommend consider there be no pre load map for this gp to go by . any feedback on what to use this device with would be greatly apprecait .