I have had a quick look but this a a web app and would use my data connection when i am out of Wifi....not good for me as i dont use data plans. The theory is great for an app like this, however it needs to be a full app and only use GPS, when a user installs they could be asked what map to they want to install...Ireland for example, then i have my map pre-loaded. I found it quite slow to use, but the main issue is that its a web app, good idea but sadly not for me. Cheers Colm