There seems to be many complaints about the slow GPS satellite lock with N810 Internet Tablet. According to my experience, the locking time can be vastly decreased by installing the latest version of OS2008. This could be explained by that my N810 was part of the first N810 sold in the European web stores, and the OS seemed still to lack the final touch at the time of the purchase. New OS version helped!
Then, the really cool stuff was to install the
Maemo Mapper uses raster maps from Open Street Map. Some writings mentioned this to work well for walking and biking use. Purely vector based maps were recommended for car use where maps need to be updated more frequently.