navigation

hi,
I saw that many people are mentioning the nav4all navigation system. I also heard that it is the most recently technology and more importantly, it is free for downloading. Could any user who had the experience give some advices? I am also considering using it in my mobile phone.Thanks!

[getsurfers]

Only problem I see is how much it would cost to get the map/route info via GPRS each time.

Use it a lot, and you could end up with a huge mobile bill.