Right, i've tried the apps mentioned on here
my findings are:
This looks good, but i see no map data, i've enabled the gps etc but still no joy
Also looks good (better that the above) but i had issues loading maps, is there a way to download everything for my route for openstreetmap so it doesn't try and download it all over GPRS?
Nice and quick, but again, it downloads maps as you need it, ideally i want to just download the maps i need for my route (is this possible?)
Also it doesn't show the cycle routes properly, so i have to use sat view
any help with the above appreciated as i got the bike ride tomorrow and i dont want my battery to run out in the first few hours (its a 120mile ride!)