Does anyone know if I can get OS maps onto my N900? I have a number of walks planned and would like to have my N900 as backup if I get lost. The walks will be off road so sat nav is useless. To some extent I maybe google maps will work, but I'm looking for something a bit more useful. Ideally I would like to use my N900 to record the routes, but I very much doubt that the battery will last that long!