I have a few questions about maemo mapper

I just installed Maemo Mapper 2.3.1 and it looks like a typical map program. Does it have something like a car GPS system where it tells you when to turn and give directions? if not, which program can?

Also, I am still waiting for my SD card to come in and i heard the maps for USA were big. is there anyway i can start downloading them now on my desktop and transfer it onto my N800? Where do I go to download them?