I have a garmin etrex summit that I use to put my cycle routes on. If i'm not sure where I am I just follow the route, easy. However a few days ago I was following the route when I came across a road closure. I was not sure where I was so the only option to me was to go back the way I had come. I have a T mobile MDA phone (shown below) which I have tom tom on and I also have a seperate bluetooth GPS. http://www.t-mobile.com/shop/phones/Detail.aspx?device=8802ddeb-1ee4-477a-9608-d9cd1e2a903f I was thinking about putting memory Map software onto my PDA to enable me to follow a planned route but if I do need to change the route when I am out on the bike I will be able to do this with no problem. The only problem with this set up, is that the PDA is not waterproof and does not fit onto a handlebar/stem and also the battery life is not great. The battery problem can be solved. I will get an extended life battery or buy a very long life battery life extender that plugs into the phone. Does anyone know where I can get a waterproof pocket that enables you to attach it onto a stem/handlebar. i know that Ortieb does one that fits onto a bar bag. This would be ideal if it fitted onto a stem etc. So could anyone suggest or point me into the direction of a suitable product. Many thanks for your help. Oh, I also know of a brand new stand alone product that does all the above but is a bit beyond me at the moment.